input: 
  def generate_natural_language_response(utterance: str) -> str:
      """Given an utterance, the function should generate a natural language response.
      It uses a pre-trained model to make predictions based on the input utterance.
  
      >>> generate_natural_language_response("What time is it?")
      "The time is 9:45 AM."
      >>> generate_natural_language_response("How are you?")
      "I'm just a computer program, so I don't have feelings, but thanks for asking!"
      """
  
      # Placeholder for model loading and prediction logic
      model = load_trained_model()
      response = model.predict(utterance)
      return response
  
output:     # Placeholder for model loading and prediction logic
      model = load_trained_model()
      response = model.predict(utterance)
      return response