input: from typing import List
  
  def virtual_assistant_using_dialogflow(project_id: str, session_id: str) -> None:
      """ Implement a virtual assistant using Python and Dialogflow to answer a basic set of questions.
      The function will take a project_id and session_id as input, initialize a Dialogflow session,
      and continuously prompt the user for input. It will then relay the input to Dialogflow for processing
      and print the assistant's response.
      
      Example:
      virtual_assistant_using_dialogflow('project-id', 'session-id')
      > User: What is the capital of France?
      > Assistant: The capital of France is Paris.
      > User: How are you?
      > Assistant: I'm just a program, so I don't have feelings, but I'm here to help!
      """
output:     from google.cloud import dialogflow
      import os
  
      os.environ["GOOGLE_APPLICATION_CREDENTIALS"] = "path/to/your/service-account-file.json"
  
      session_client = dialogflow.SessionsClient()
      session = session_client.session_path(project_id, session_id)
  
      while True:
          user_input = input("User: ")
          text_input = dialogflow.types.TextInput(text=user_input, language_code="en-US")
          query_input = dialogflow.types.QueryInput(text=text_input)
  
          response = session_client.detect_intent(session=session, query_input=query_input)
  
          print(f"Assistant: {response.query_result.fulfillment_text}")