input: def generate_natural_language_response(utterance: str, model) -> str:
      """ Generates a natural language response for a given utterance using a trained model.
      >>> generate_natural_language_response("What time is it?", trained_model)
      '<response from the model>'  # The actual response from the model to the utterance "What time is it?"
      """
      prediction = model.predict(utterance)
      return prediction
output:     prediction = model.predict(utterance)
      return prediction