input: def create_virtual_assistant(project_id: str, session_id: str) -> None:
      """Create a virtual assistant using Python and Dialogflow to answer a basic set of questions.
      The assistant interacts with the user through a loop, taking input from the user and providing responses
      based on the Dialogflow intents.
      >>> create_virtual_assistant('my-project-id', 'my-session-id')
      User: What is the weather today?
      Assistant: The weather today is sunny with a temperature of 25°C.
      User: Who is the president?
      Assistant: The current president is Joe Biden.
      """
      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.display_name == 'Default Fallback Intent':
          print('Assistant: I didn\'t understand that. Can you please rephrase?')