input: 
  from typing import Tuple
  import dialogflow_v2 as dialogflow
  
  def virtual_assistant(project_id: str) -> str:
      """
      Create a virtual assistant using Python and Dialogflow to answer basic user questions.
      This function initializes the Dialogflow session and continuously interacts with the user,
      providing responses based on the Dialogflow query results.
  
      >>> virtual_assistant('test-project')
      User: What's the weather today?
      Assistant: The weather today is sunny.
      User: Who is the president of the United States?
      Assistant: The current president of the United States is Joe Biden.
      """
      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)
  
      return "Virtual assistant session ended."
  
output:     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)
  
      return "Virtual assistant session ended."