[{'role': 'USR', 'utterance': "I'm looking for a pan I can use in my kitchen."}
 {'role': 'SYS', 'utterance': 'What size pan were you thinking of?'}
 {'role': 'USR', 'utterance': "I've already got a small pan. I need a big one."}
 {'role': 'SYS', 'utterance': 'Well, this one might work for you.'}
 {'role': 'USR', 'utterance': "Oh, no, that's way too heavy a pan for me."}
 {'role': 'SYS', 'utterance': "Here, lift this aluminum pan. It's the same size."}
 {'role': 'USR', 'utterance': "Yes, it's very lightweight. But I don't want this aluminum handle."}]
{'role': 'SYS', 'utterance': "Here's a similar aluminum pan. But it has a heat-resistant handle."}