input: 
  from typing import List
  
  
  def virtual_assistant(language_code: str) -> None:
      """ Create a virtual assistant using Dialogflow to answer a basic set of questions.
      The assistant will continuously prompt the user for input and respond using Dialogflow.
      >>> virtual_assistant('en-US')
      """
      import dialogflow_v2 as dialogflow
      import requests
  
      project_id = 'project-id'
      session_client = dialogflow.SessionsClient()
      session = session_client.session_path(project_id, 'session-id')
  
      while True:
          text = input('User: ')
          text_input = dialogflow.types.TextInput(text=text, language_code=language_code)
          query_input = dialogflow.types.QueryInput(text=text_input)
          response = session_client.detect_intent(session=session, query_input=query_input)
  
          print('Assistant:', response.query_result.fulfillment_text)
  
output:     if text.lower() in ['exit', 'quit', 'bye']:
          print('Assistant: Goodbye!')
          break