input: Write a function to create a virtual assistant using Python and Dialogflow to 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. The function should include necessary imports and configuration for Dialogflow.
  
  def create_virtual_assistant(project_id, session_id):
      import dialogflow_v2 as dialogflow
      import requests
  
      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)
  
  assert create_virtual_assistant('project-id', 'session-id')==None
  assert create_virtual_assistant('another-project-id', 'another-session-id')==None
output: def create_virtual_assistant(project_id, session_id):
      import dialogflow_v2 as dialogflow
      import requests
  
      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)