input: Write a function to create a virtual assistant using Python and Dialogflow that can answer a basic set of questions. The function should continuously prompt the user for input, send the input to Dialogflow for processing, and then print the assistant's response. If no input is provided, the loop should continue to wait for user input.
  
  
  import dialogflow_v2 as dialogflow
  import requests
  
  def create_virtual_assistant(project_id: str, session_id: str):
      session_client = dialogflow.SessionsClient()
      session = session_client.session_path(project_id, session_id)
  
      while True:
          text = input('User: ')
          if not text:
              continue
          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)
  
  assert create_virtual_assistant('project-id', 'session-id') is None
  assert create_virtual_assistant('another-project-id', 'another-session-id') is None
  
output: def create_virtual_assistant(project_id: str, session_id: str):
      session_client = dialogflow.SessionsClient()
      session = session_client.session_path(project_id, session_id)
  
      while True:
          text = input('User: ')
          if not text:
              continue
          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)