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I am creating a chatbot with pymessenger and wit.at. I am taking value through one entity suppose greeting and there I am setting parameters for another function but it is not working when I am calling other function.

def get_message():

    sample_responses = ["Hey Welcome May I know your Roll Number?", "Hi Welcome to  May I know your Roll Number"]

    return random.choice(sample_responses)



def cust(value):

    if value =="111":

        t1 = "Thor"

        val_off = "1"

    elif value =="222":

        t1 = "Steve"

        val_off = "2"

    elif value =="333":

        t1 = "Tony"

        val_off = "3"

    else:

        t1= ""

        val_off =""



def get_offer(val_off):

    if val_off == "1":

        offer_test = ("1. Thor"+"n"+"2. Thor: Ragnarok+"n"+"3. Avenger Series")

    elif val_off == "2":

        offer_test = ("1. First Avenger"+"n"+"2. Winter Soldier"+"n"+"3. Civil War")

    elif val_off =="3":

        offer_test = ("1. Iron Man 1"+"n"+"2. Iron Man 2"+"n"+"3. Civil War")

    return offer_test





app.route('/', methods=['POST'])

def webhook():

    data = request.get_json()

    log(data)

    if data['object'] == 'page':

        for entry in data['entry']:

            for messaging_event in entry['messaging']:



                sender_id = messaging_event['sender']['id']

                recipient_id = messaging_event['recipient']['id']



                if messaging_event.get('message'):

                    if 'text' in messaging_event['message']:

                        messaging_text = messaging_event['message']['text']

                    else:

                        messaging_text = 'no text'



                    response = None



                    entity, value = wit_response(messaging_text)





                    if entity == 'cust_greet':

                        response = get_message()

                    elif entity == 'cust_id':

                        test = cust(str(value))

                        val_off = test[1]

                        offer_response = get_offer(str(val_off))

                        esponse = "Hey "+test[0] +"👋. "+"n"+"How Can I help you? Are you interested in"+"n"+"1.Bio"+"n"+"2. Movie list"

                    elif entity == 'cust_movie':

                        response = offer_response



                    bot.send_text_message(sender_id, response)

When provide roll number : eg. 111 function cust() will be called it will tell the name as Thor and set val_off = 1 and call the function call_offer. But when I select option "2. Movie list" I am getting error:

" response = offer_response
UnboundLocalError: local variable 'offer_response' referenced before assignment"

Sample function:

def cust(value):

offer_response ="" ## if it is a string

offer_response = 0 ## if it is a number

    if value =="111":

        t1 = "Thor"

        val_off = "1"

        offer_response = get_offer(str(val_off)) 

Try this:

elif entity == 'cust_movie':

    response = "Please let me know the type of movie by pressing only the digit"+"n"+"1.Thor Series"+"n"+"2. Avenger Series" +"n"+"3.. Iron Man Series"

elif entity in( '1' , '2' ,'3'):

    response = get_offer(entity)        

So, As you type "cust_movie" the bot will ask you to press the type of movie you want to see. It will store the value 1,2,3

As per user entry of 1,2 or 3 the bot will check for another elif loop and go to get_offer function and the subsequent movie list will be displayed