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, process the input using Dialogflow, and print the assistant's response. If the input from the user is "exit", the function should terminate.
  assert virtual_assistant()==None
  assert virtual_assistant()==None
  assert virtual_assistant()==None
  assert virtual_assistant()==None
  assert virtual_assistant()==None
output: def virtual_assistant():
      while True:
          user_input = input("You: ")
          if user_input.lower() == "exit":
              break
          # Process user_input using Dialogflow and get the response
          # response = dialogflow_process(user_input)
          # For the purpose of this example, let's assume the response is a simple echo
          response = user_input
          print(f"Assistant: {response}")