input: 
  def create_virtual_assistant(project_id: str, session_id: str) -> None:
      """Creates a virtual assistant using Python and Dialogflow to answer a basic set of questions.
      The assistant will continuously prompt the user for input and provide responses based on the
      Dialogflow session.
  
      >>> create_virtual_assistant('project-id', 'session-id')
      User: What is the capital of France?
      Assistant: The capital of France is Paris.
      User: How old is the Eiffel Tower?
      Assistant: The Eiffel Tower is over 130 years old.
      """
      import dialogflow_v2 as dialogflow
  
      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='en-US')
          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 response.query_result.intent.is_fallback:
          print('Assistant: I did not understand that. Can you please rephrase?')