diff --git a/examples/interact/main.go b/examples/interact/main.go
new file mode 100644
index 000000000..a20dc4ca5
--- /dev/null
+++ b/examples/interact/main.go
@@ -0,0 +1,140 @@
+package main
+
+import (
+	"context"
+	"fmt"
+	"os"
+	"strconv"
+	"strings"
+	"syscall"
+	"time"
+
+	log "github.com/sirupsen/logrus"
+	tb "gopkg.in/tucnak/telebot.v2"
+
+	"github.com/c9s/bbgo/pkg/cmd/cmdutil"
+	"github.com/c9s/bbgo/pkg/interact"
+)
+
+func parseFloatPercent(s string, bitSize int) (f float64, err error) {
+	i := strings.Index(s, "%")
+	if i < 0 {
+		return strconv.ParseFloat(s, bitSize)
+	}
+
+	f, err = strconv.ParseFloat(s[:i], bitSize)
+	if err != nil {
+		return 0, err
+	}
+	return f / 100.0, nil
+}
+
+type closePositionTask struct {
+	symbol     string
+	percentage float64
+	confirmed  bool
+}
+
+type PositionInteraction struct {
+	closePositionTask closePositionTask
+}
+
+func (m *PositionInteraction) Commands(i *interact.Interact) {
+	i.Command("/closePosition", func(reply interact.Reply) error {
+		// send symbol options
+		reply.Message("Choose your position")
+		for _, symbol := range []string{"BTCUSDT", "ETHUSDT"} {
+			reply.AddButton(symbol)
+		}
+
+		return nil
+	}).Next(func(reply interact.Reply, symbol string) error {
+		// get symbol from user
+		if len(symbol) == 0 {
+			reply.Message("Please enter a symbol")
+			return fmt.Errorf("empty symbol")
+		}
+		switch symbol {
+		case "BTCUSDT", "ETHUSDT":
+
+		default:
+			reply.Message("Invalid symbol")
+			return fmt.Errorf("invalid symbol")
+
+		}
+
+		m.closePositionTask.symbol = symbol
+
+		reply.Message("Choose or enter the percentage to close")
+		for _, symbol := range []string{"25%", "50%", "100%"} {
+			reply.AddButton(symbol)
+		}
+
+		// send percentage options
+		return nil
+	}).Next(func(reply interact.Reply, percentageStr string) error {
+		p, err := parseFloatPercent(percentageStr, 64)
+		if err != nil {
+			reply.Message("Not a valid percentage string")
+			return err
+		}
+
+		// get percentage from user
+		m.closePositionTask.percentage = p
+
+		// send confirmation
+		reply.Message("Are you sure to close the position?")
+		reply.AddButton("Yes")
+		return nil
+	}).Next(func(reply interact.Reply, confirm string) error {
+		switch strings.ToLower(confirm) {
+		case "yes":
+			m.closePositionTask.confirmed = true
+			reply.Message(fmt.Sprintf("Your %s position is closed", m.closePositionTask.symbol))
+			reply.RemoveKeyboard()
+
+		default:
+
+		}
+		// call position close
+
+		// reply result
+		return nil
+	})
+}
+
+func main() {
+	b, err := tb.NewBot(tb.Settings{
+		// You can also set custom API URL.
+		// If field is empty it equals to "https://api.telegram.org".
+		// URL: "http://195.129.111.17:8012",
+
+		Token:  os.Getenv("TELEGRAM_BOT_TOKEN"),
+		Poller: &tb.LongPoller{Timeout: 10 * time.Second},
+		// Synchronous: false,
+		// Verbose: true,
+		// ParseMode:   "",
+		// Reporter:    nil,
+		// Client:      nil,
+		// Offline:     false,
+	})
+
+	if err != nil {
+		log.Fatal(err)
+		return
+	}
+
+	ctx := context.Background()
+
+	globalInteraction := interact.New()
+	globalInteraction.SetMessenger(&interact.Telegram{
+		Interact: globalInteraction,
+		Bot:      b,
+	})
+
+	globalInteraction.AddCustomInteraction(&PositionInteraction{})
+	if err := globalInteraction.Start(ctx); err != nil {
+		log.Fatal(err)
+	}
+	cmdutil.WaitForSignal(ctx, syscall.SIGINT, syscall.SIGTERM)
+}
diff --git a/examples/telebot/main.go b/examples/telebot/main.go
index 1c5e54b2f..64fa760ba 100644
--- a/examples/telebot/main.go
+++ b/examples/telebot/main.go
@@ -1,12 +1,11 @@
 package main
 
 import (
-	"fmt"
-	"log"
 	"os"
 	"time"
 
 	"github.com/google/uuid"
+	log "github.com/sirupsen/logrus"
 	tb "gopkg.in/tucnak/telebot.v2"
 )
 
@@ -33,7 +32,7 @@ func main() {
 		Token:  os.Getenv("TELEGRAM_BOT_TOKEN"),
 		Poller: &tb.LongPoller{Timeout: 10 * time.Second},
 		// Synchronous: false,
-		Verbose: true,
+		Verbose: false,
 		// ParseMode:   "",
 		// Reporter:    nil,
 		// Client:      nil,
@@ -55,6 +54,8 @@ func main() {
 
 	// On reply button pressed (message)
 	b.Handle(&btnHelp, func(m *tb.Message) {
+		log.Infof("btnHelp: %#v", m)
+
 		var (
 			// Inline buttons.
 			//
@@ -86,18 +87,18 @@ func main() {
 	})
 
 	b.Handle("/hello", func(m *tb.Message) {
-		fmt.Printf("message: %#v\n", m)
+		log.Infof("/hello %#v", m)
 		// b.Send(m.Sender, "Hello World!")
 	})
 
 	b.Handle(tb.OnText, func(m *tb.Message) {
-		fmt.Printf("text: %#v\n", m)
+		log.Infof("[onText] %#v", m)
 		// all the text messages that weren't
 		// captured by existing handlers
 	})
 
 	b.Handle(tb.OnQuery, func(q *tb.Query) {
-		fmt.Printf("query: %#v\n", q)
+		log.Infof("[onQuery] %#v", q)
 
 		// r := &tb.ReplyMarkup{}
 		// r.URL("test", "https://media.tenor.com/images/f176705ae1bb3c457e19d8cd71718ac0/tenor.gif")
diff --git a/pkg/interact/command.go b/pkg/interact/command.go
new file mode 100644
index 000000000..564c32b36
--- /dev/null
+++ b/pkg/interact/command.go
@@ -0,0 +1,70 @@
+package interact
+
+import "strconv"
+
+// Command is a domain specific language syntax helper
+// It's used for helping developer define the state and transition function
+type Command struct {
+	// Name is the command name
+	Name string
+
+	// StateF is the command handler function
+	F interface{}
+
+	stateID              int
+	states               map[State]State
+	statesFunc           map[State]interface{}
+	initState, lastState State
+}
+
+func NewCommand(name string, f interface{}) *Command {
+	c := &Command{
+		Name:       name,
+		F:          f,
+		states:     make(map[State]State),
+		statesFunc: make(map[State]interface{}),
+		initState:  State(name + "_" + strconv.Itoa(0)),
+	}
+	return c.Next(f)
+}
+
+// Transit defines the state transition that is not related to the last defined state.
+func (c *Command) Transit(state1, state2 State, f interface{}) *Command {
+	c.states[state1] = state2
+	c.statesFunc[state1] = f
+	return c
+}
+
+func (c *Command) NamedNext(n string, f interface{}) *Command {
+	var curState State
+	if c.lastState == "" {
+		curState = State(c.Name + "_" + strconv.Itoa(c.stateID))
+	} else {
+		curState = c.lastState
+	}
+
+	nextState := State(n)
+	c.states[curState] = nextState
+	c.statesFunc[curState] = f
+	c.lastState = nextState
+	return c
+}
+
+// Next defines the next state with the transition function from the last defined state.
+func (c *Command) Next(f interface{}) *Command {
+	var curState State
+	if c.lastState == "" {
+		curState = State(c.Name + "_" + strconv.Itoa(c.stateID))
+	} else {
+		curState = c.lastState
+	}
+
+	// generate the next state by the stateID
+	c.stateID++
+	nextState := State(c.Name + "_" + strconv.Itoa(c.stateID))
+
+	c.states[curState] = nextState
+	c.statesFunc[curState] = f
+	c.lastState = nextState
+	return c
+}
diff --git a/pkg/interact/interact.go b/pkg/interact/interact.go
index 79c2f77a4..76579d7dc 100644
--- a/pkg/interact/interact.go
+++ b/pkg/interact/interact.go
@@ -1,128 +1,148 @@
 package interact
 
 import (
+	"context"
 	"fmt"
 	"reflect"
 	"strconv"
 	"strings"
 	"text/scanner"
 
-	"gopkg.in/tucnak/telebot.v2"
+	log "github.com/sirupsen/logrus"
 )
 
-type Command struct {
-	// Name is the command name
-	Name string
-
-	// StateF is the command handler function
-	F interface{}
-
-	stateID    int
-	states     map[string]string
-	statesFunc map[string]interface{}
-	initState  string
+type Reply interface {
+	Message(message string)
+	AddButton(text string)
+	RemoveKeyboard()
 }
 
-func NewCommand(name string, f interface{}) *Command {
-	c := &Command{
-		Name:       name,
-		F:          f,
-		states:     make(map[string]string),
-		statesFunc: make(map[string]interface{}),
-		initState:  name + "_" + strconv.Itoa(0),
-	}
-	return c.Next(f)
+type Responder func(reply Reply, response string) error
+
+type CustomInteraction interface {
+	Commands(interact *Interact)
 }
 
-func (c *Command) Next(f interface{}) *Command {
-	curState := c.Name + "_" + strconv.Itoa(c.stateID)
-	c.stateID++
-	nextState := c.Name + "_" + strconv.Itoa(c.stateID)
+type State string
 
-	c.states[curState] = nextState
-	c.statesFunc[curState] = f
-	return c
+const (
+	StatePublic        State = "public"
+	StateAuthenticated State = "authenticated"
+)
+
+type Messenger interface {
+	AddCommand(command string, responder Responder)
+	Start()
 }
 
 // Interact implements the interaction between bot and message software.
 type Interact struct {
 	commands map[string]*Command
 
-	states     map[string]string
-	statesFunc map[string]interface{}
-	curState   string
+	states     map[State]State
+	statesFunc map[State]interface{}
+
+	originState, currentState State
+
+	messenger Messenger
 }
 
 func New() *Interact {
 	return &Interact{
-		commands:   make(map[string]*Command),
-		states:     make(map[string]string),
-		statesFunc: make(map[string]interface{}),
+		commands:     make(map[string]*Command),
+		originState:  StatePublic,
+		currentState: StatePublic,
+		states:       make(map[State]State),
+		statesFunc:   make(map[State]interface{}),
 	}
 }
 
+func (i *Interact) SetOriginState(s State) {
+	i.originState = s
+}
+
+func (i *Interact) AddCustomInteraction(custom CustomInteraction) {
+	custom.Commands(i)
+}
+
 func (i *Interact) Command(command string, f interface{}) *Command {
 	cmd := NewCommand(command, f)
 	i.commands[command] = cmd
 	return cmd
 }
 
-func (i *Interact) getNextState(currentState string) (nextState string, end bool) {
+func (i *Interact) getNextState(currentState State) (nextState State, final bool) {
 	var ok bool
+	final = false
 	nextState, ok = i.states[currentState]
 	if ok {
-		end = false
-		return nextState, end
+		// check if it's the final state
+		if _, hasTransition := i.statesFunc[nextState]; !hasTransition {
+			final = true
+		}
+
+		return nextState, final
 	}
 
-	end = true
-	return nextState, end
+	// state not found, return to the origin state
+	return i.originState, final
 }
 
-func (i *Interact) handleResponse(text string) error {
+func (i *Interact) setState(s State) {
+	log.Infof("[interact]: tansiting state from %s -> %s", i.currentState, s)
+	i.currentState = s
+}
+
+func (i *Interact) handleResponse(text string, ctxObjects ...interface{}) error {
 	args := parseCommand(text)
 
-	f, ok := i.statesFunc[i.curState]
+	f, ok := i.statesFunc[i.currentState]
 	if !ok {
-		return fmt.Errorf("state function of %s is not defined", i.curState)
+		return fmt.Errorf("state function of %s is not defined", i.currentState)
 	}
 
-	err := parseFuncArgsAndCall(f, args)
+	err := parseFuncArgsAndCall(f, args, ctxObjects...)
 	if err != nil {
 		return err
 	}
 
-	nextState, end := i.getNextState(i.curState)
+	nextState, end := i.getNextState(i.currentState)
 	if end {
+		i.setState(i.originState)
 		return nil
 	}
 
-	i.curState = nextState
+	i.setState(nextState)
 	return nil
 }
 
-func (i *Interact) runCommand(command string, args ...string) error {
+func (i *Interact) runCommand(command string, args []string, ctxObjects ...interface{}) error {
 	cmd, ok := i.commands[command]
 	if !ok {
 		return fmt.Errorf("command %s not found", command)
 	}
 
-	i.curState = cmd.initState
-	err := parseFuncArgsAndCall(cmd.F, args)
+	i.setState(cmd.initState)
+	err := parseFuncArgsAndCall(cmd.F, args, ctxObjects...)
 	if err != nil {
 		return err
 	}
 
 	// if we can successfully execute the command, then we can go to the next state.
-	nextState, end := i.getNextState(i.curState)
+	nextState, end := i.getNextState(i.currentState)
 	if end {
+		i.setState(i.originState)
 		return nil
 	}
 
-	i.curState = nextState
+	i.setState(nextState)
 	return nil
 }
 
+func (i *Interact) SetMessenger(messenger Messenger) {
+	i.messenger = messenger
+}
+
 func (i *Interact) init() error {
 	for n, cmd := range i.commands {
 		_ = n
@@ -136,17 +156,29 @@ func (i *Interact) init() error {
 		for s, f := range cmd.statesFunc {
 			i.statesFunc[s] = f
 		}
+
+		// register commands to the service
+		if i.messenger == nil {
+			return fmt.Errorf("messenger is not set")
+		}
+
+		i.messenger.AddCommand(n, func(reply Reply, response string) error {
+			args := parseCommand(response)
+			return i.runCommand(n, args, reply)
+		})
 	}
 
 	return nil
 }
 
-func (i *Interact) HandleTelegramMessage(msg *telebot.Message) {
-	// For registered commands, will contain the string payload
-	// msg.Payload
-	// msg.Text
-	args := parseCommand(msg.Text)
-	_ = args
+func (i *Interact) Start(ctx context.Context) error {
+	if err := i.init(); err != nil {
+		return err
+	}
+
+	// TODO: use go routine and context
+	i.messenger.Start()
+	return nil
 }
 
 func parseCommand(src string) (args []string) {
diff --git a/pkg/interact/interact_test.go b/pkg/interact/interact_test.go
index 51d289b5c..5797dc6e5 100644
--- a/pkg/interact/interact_test.go
+++ b/pkg/interact/interact_test.go
@@ -7,6 +7,7 @@ import (
 	"testing"
 
 	"github.com/stretchr/testify/assert"
+	tb "gopkg.in/tucnak/telebot.v2"
 )
 
 func Test_parseFuncArgsAndCall_NoErrorFunction(t *testing.T) {
@@ -66,11 +67,8 @@ type TestInteraction struct {
 	closePositionTask closePositionTask
 }
 
-type Reply interface {
-}
-
 func (m *TestInteraction) Commands(interact *Interact) {
-	interact.Command("closePosition", func(reply Reply) error {
+	interact.Command("/closePosition", func(reply Reply) error {
 		// send symbol options
 		return nil
 	}).Next(func(symbol string) error {
@@ -95,29 +93,43 @@ func (m *TestInteraction) Commands(interact *Interact) {
 }
 
 func TestCustomInteraction(t *testing.T) {
+	b, err := tb.NewBot(tb.Settings{
+		Offline: true,
+	})
+	if !assert.NoError(t, err, "should have bot setup without error") {
+		return
+	}
+
 	globalInteraction := New()
+
+	telegram := &Telegram{
+		Bot:      b,
+		Interact: globalInteraction,
+	}
+	globalInteraction.SetMessenger(telegram)
+
 	testInteraction := &TestInteraction{}
 	testInteraction.Commands(globalInteraction)
 
-	err := globalInteraction.init()
+	err = globalInteraction.init()
 	assert.NoError(t, err)
 
-	err = globalInteraction.runCommand("closePosition")
+	err = globalInteraction.runCommand("/closePosition", []string{}, telegram.newReply())
 	assert.NoError(t, err)
 
-	assert.Equal(t, "closePosition_1", globalInteraction.curState)
+	assert.Equal(t, State("/closePosition_1"), globalInteraction.currentState)
 
-	err = globalInteraction.handleResponse("BTCUSDT")
+	err = globalInteraction.handleResponse("BTCUSDT", telegram.newReply())
 	assert.NoError(t, err)
-	assert.Equal(t, "closePosition_2", globalInteraction.curState)
+	assert.Equal(t, State("/closePosition_2"), globalInteraction.currentState)
 
-	err = globalInteraction.handleResponse("0.20")
+	err = globalInteraction.handleResponse("0.20", telegram.newReply())
 	assert.NoError(t, err)
-	assert.Equal(t, "closePosition_3", globalInteraction.curState)
+	assert.Equal(t, State("/closePosition_3"), globalInteraction.currentState)
 
-	err = globalInteraction.handleResponse("true")
+	err = globalInteraction.handleResponse("true", telegram.newReply())
 	assert.NoError(t, err)
-	assert.Equal(t, "closePosition_4", globalInteraction.curState)
+	assert.Equal(t, State("public"), globalInteraction.currentState)
 
 	assert.Equal(t, closePositionTask{
 		symbol:     "BTCUSDT",
diff --git a/pkg/interact/telegram.go b/pkg/interact/telegram.go
new file mode 100644
index 000000000..bcda4a89f
--- /dev/null
+++ b/pkg/interact/telegram.go
@@ -0,0 +1,89 @@
+package interact
+
+import (
+	"fmt"
+
+	log "github.com/sirupsen/logrus"
+	"gopkg.in/tucnak/telebot.v2"
+)
+
+type TelegramReply struct {
+	bot     *telebot.Bot
+	message string
+	menu    *telebot.ReplyMarkup
+	buttons [][]telebot.Btn
+}
+
+func (r *TelegramReply) Message(message string) {
+	r.message = message
+}
+
+func (r *TelegramReply) RemoveKeyboard() {
+	r.menu.ReplyKeyboardRemove = true
+}
+
+func (r *TelegramReply) AddButton(text string) {
+	var button = r.menu.Text(text)
+	if len(r.buttons) == 0 {
+		r.buttons = append(r.buttons, []telebot.Btn{})
+	}
+	r.buttons[len(r.buttons)-1] = append(r.buttons[len(r.buttons)-1], button)
+}
+
+func (r *TelegramReply) build() {
+	var rows []telebot.Row
+	for _, buttons := range r.buttons {
+		rows = append(rows, telebot.Row(buttons))
+	}
+	r.menu.Reply(rows...)
+}
+
+//go:generate callbackgen -type Telegram
+type Telegram struct {
+	Interact *Interact
+	Bot      *telebot.Bot
+
+	// messageCallbacks is used for interact to register its message handler
+	messageCallbacks []func(reply Reply, message string)
+}
+
+func (b *Telegram) Start() {
+	b.Bot.Handle(telebot.OnText, func(m *telebot.Message) {
+		log.Infof("onText: %+v", m)
+
+		reply := b.newReply()
+		if err := b.Interact.handleResponse(m.Text, reply); err != nil {
+			log.WithError(err).Errorf("response handling error")
+		}
+
+		reply.build()
+		if _, err := b.Bot.Send(m.Sender, reply.message, reply.menu); err != nil {
+			log.WithError(err).Errorf("message send error")
+		}
+	})
+	go b.Bot.Start()
+}
+
+func (b *Telegram) AddCommand(command string, responder Responder) {
+	b.Bot.Handle(command, func(m *telebot.Message) {
+		reply := b.newReply()
+		if err := responder(reply, m.Payload); err != nil {
+			log.WithError(err).Errorf("responder error")
+			b.Bot.Send(m.Sender, fmt.Sprintf("error: %v", err))
+			return
+		}
+
+		// build up the response objects
+		reply.build()
+		if _, err := b.Bot.Send(m.Sender, reply.message, reply.menu); err != nil {
+			log.WithError(err).Errorf("message send error")
+		}
+	})
+}
+
+func (b *Telegram) newReply() *TelegramReply {
+	return &TelegramReply{
+		bot:  b.Bot,
+		menu: &telebot.ReplyMarkup{ResizeReplyKeyboard: true},
+	}
+}