input: 
  def generate_response(utterance: str) -> str:
      """ Generate a natural language response based on the given utterance using a pre-trained model.
      >>> generate_response("What time is it?")
      ['Response based on model prediction']
      >>> generate_response("Hello, how are you?")
      ['Response based on model prediction']
      """
  
output:     return ['Response based on model prediction']