[{'role': 'USR', 'utterance': 'Hi, there! Did you have any questions about our bikes?'}
 {'role': 'SYS', 'utterance': 'Yeah. Do you work on bicycles in addition to selling them?'}
 {'role': 'USR', 'utterance': 'Oh, yes, we can handle any repairs you may need.'}
 {'role': 'SYS', 'utterance': "That's great, but what I need is not exactly a repair. My cousin gave me a road bike, but I'm not tall enough to ride it. Can you put smaller wheels on it?"}
 {'role': 'USR', 'utterance': "We could do that, but I wouldn't recommend it, because you would have to use your legs more to go the same distance. You'd be better off buying a bike that's the right size for you."}
 {'role': 'SYS', 'utterance': "I was afraid you'd say that. You see, my cousin's bike is a very expensive model. It's a really nice bike."}
 {'role': 'USR', 'utterance': 'Have you considered trading the bike in? We do buy and sell used bikes, and I can give you a fair price for any trade-in.'}]
{'role': 'SYS', 'utterance': 'Really? That would be great! How much can you give me for the bike?'}