[{'role': 'USR', 'utterance': 'May I help you?'}
 {'role': 'SYS', 'utterance': 'Yes, I want to buy some shoes to replace the ones I am wearing.'}
 {'role': 'USR', 'utterance': "What's wrong with them?"}
 {'role': 'SYS', 'utterance': 'They are too old and shabby.'}
 {'role': 'USR', 'utterance': 'I can see they are simply worn out. Would you like the same color?'}
 {'role': 'SYS', 'utterance': 'Yes.'}
 {'role': 'USR', 'utterance': 'How about this light brown pair?'}
 {'role': 'SYS', 'utterance': "Yes, I'll try them on."}
 {'role': 'USR', 'utterance': 'They certainly look charming.'}
 {'role': 'SYS', 'utterance': 'The trouble is they feel uncomfortable.'}
 {'role': 'USR', 'utterance': 'Then try on another pair of the similar style.'}
 {'role': 'SYS', 'utterance': "They are much better. Do you have them in red'?"}
 {'role': 'USR', 'utterance': 'Yes. Would you like both pairs?'}]
{'role': 'SYS', 'utterance': "Yes, if they don't cost too much."}