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 continuously prompts the user for input, processes it using Dialogflow,
      and then prints the assistant's response.
      Example:
      >>> create_virtual_assistant('project-id', 'session-id')
      User: What is the capital of France?
      Assistant: The capital of France is Paris.
      User: Who wrote the play "Romeo and Juliet"?
      Assistant: "Romeo and Juliet" was written by William Shakespeare.
      """
output:     from google.cloud import dialogflow
      import os
  
      os.environ["GOOGLE_APPLICATION_CREDENTIALS"] = "path_to_your_credentials_file.json"
  
      session_client = dialogflow.SessionsClient()
      session = session_client.session_path(project_id, session_id)
  
      while True:
          user_input = input("User: ")
          text_input = dialogflow.TextInput(text=user_input, language_code="en")
          query_input = dialogflow.QueryInput(text=text_input)
  
          response = session_client.detect_intent(
              request={"session": session, "query_input": query_input}
          )
  
          print(f"Assistant: {response.query_result.fulfillment_text}")