[{'role': 'USR', 'utterance': 'That China-gown of Tang-Dynasty style is so beautiful. Would you show it to me, please?'}
 {'role': 'SYS', 'utterance': 'Absolutely. Here it is.'}
 {'role': 'USR', 'utterance': 'Could I try it on?'}
 {'role': 'SYS', 'utterance': 'Please do, the fitting-room is over there.'}
 {'role': 'USR', 'utterance': 'It feels a little tight around the waist. Do you have a bigger one?'}]
{'role': 'SYS', 'utterance': "I'm sorry. We don't have this color in your size. We have some green ones in your size. Would you please have a look at this green one?"}