RASA on Google Colab: Unable to run Actions

Rasa Open Source
1 
I am trying to implement RASA Chatbot on Colab and finding hard to customize Actions.. Rest all works fine, except the actions.. I feel that my chatbox is not entering my actions.. Can anyone please guide me..

nlu_md = """
## intent:greet
- Hello
- hello
- good morning

## intent:justbook
- table for 1
- make reservations for me
- make reservations for 1 person
"""
%store nlu_md > nlu.md

stories_md = """

## Story 1
* greet 
    - action_print
"""
%store stories_md > stories.md


domain_yml = """
%YAML 1.1
---
actions:
- utter_booking_confirmation
- utter_greeting
- utter_thankyou
- __main__.Printer
- action_print


entities:
- time
- date
- number_of_people
intents:
- time
- when
- book
- greet
- justbook

  
templates:
  utter_greeting:
  - text: Welcome to the restaurant ! How can I help you ?
  utter_thankyou:
  - text: Thank You for using our services ! See you again soon !
  utter_confirm:
  - text: Your booking is confirmed for {number_of_people} on {date} at {time}. Thank You. See you soon  
"""

%store domain_yml > domain.yml

Actions

from rasa_core_sdk import Tracker
from rasa_core_sdk import Action
from rasa_core_sdk.events import SlotSet
from rasa_core_sdk.executor import CollectingDispatcher
from rasa_core.actions import Action  

     

class Printer(Action):
    	def name(self):
    		return "action_print"
    		
    	def run(self, dispatcher, tracker, domain):
    		no_of_people=tracker.slots['number_of_people']
    		time=tracker.slots['time']
    		date=tracker.slots['date']
    		print('ENTERED PRINTER')
		
    		dispatcher.utter_message('hi i am in Printer')
    		#return ''

Chatbox!

from rasa_core.agent import Agent
from rasa_core.utils import EndpointConfig
from rasa_core.interpreter import RasaNLUInterpreter
from rasa_core.utils import EndpointConfig

agent = Agent.load('models/dialogue',interpreter=RasaNLUInterpreter('/content/drive/My Drive/restaurant bot/models/nlu/default/restaurantbot'),
        action_endpoint=EndpointConfig(url="http://127.0.0.1:5055/webhook"))
print("Bot is ready to talk! Start conversation with 'hi'")
while True:
    st = input()
    if st == 'stop':
        break
    responses = agent.handle_text(st)
    for response in responses:
        print(response["text"])

Expected Output
I am expecting output : Entered Printer HI I am in Printer.
Output I get I dont get the expected output, I just get the text box for input…