input: Write a function to create a virtual assistant using Python and Dialogflow to answer a basic set of questions. The function should continuously take user input and return the assistant's response until interrupted. The assistant should use Dialogflow's session handling and language processing capabilities.
  
  import dialogflow_v2 as dialogflow
  import requests
  
  def create_virtual_assistant(project_id, session_id):
      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')  # Output will be dependent on user input and Dialogflow setup
  assert create_virtual_assistant('another-project-id', 'another-session-id')  # Output will be dependent on user input and Dialogflow setup
output: def create_virtual_assistant(project_id, session_id):
      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)