code: def get_response_time(chatbot, statement='Hello'):
      
      import time
  
      start_time = time.time()
  
      chatbot.get_response(statement)
  
      return time.time() - start_time
docs: Returns the amount of time taken for a given
      chat bot to return a response.
  
      :param chatbot: A chat bot instance.
      :type chatbot: ChatBot
  
      :returns: The response time in seconds.
      :rtype: float