[{'role': 'USR', 'utterance': "Which of the two do you think is better? I mean, what's the difference between them?"}
 {'role': 'SYS', 'utterance': "Well. . . this one costs more, but it has a much better sound. This part of it is made of wood, not plastic. And there's a tone control, too."}
 {'role': 'USR', 'utterance': 'I only want it for the kitchen. I like to listen to the news at breakfast time.'}
 {'role': 'SYS', 'utterance': "Hmm. . . well, the other one is good for the money. It's much cheaper. We sell clot of them and all our customers are satisfied with them."}
 {'role': 'USR', 'utterance': "Hmm. . . I'd like the cheaper one, please. Can I pay by cheque?"}]
{'role': 'SYS', 'utterance': 'Certainly.'}