[{'role': 'USR', 'utterance': "Good morning. I'm thinking about buying some new furniture for my living room. Could you help me?"}
 {'role': 'SYS', 'utterance': 'Certainly. As you can see, we have several three-piece suites on sale. Feel free to sit down and test how comfortable they are.'}
 {'role': 'USR', 'utterance': "I came to your store yesterday and have come back today to make a final decision. I think I like the black leather suite. It's on sale, isn't it."}
 {'role': 'SYS', 'utterance': "Yes. The price has been reduced by 50 %. It's a real bargain."}
 {'role': 'USR', 'utterance': "I'll take it. I also need to improve the lighting in my living room. Do you have any suggestions?"}]
{'role': 'SYS', 'utterance': "Those floor lamps are very nice and you can vary the brightness according to whether you're reading or watching tv. How big is your living room?"}