[{'role': 'USR', 'utterance': 'What can I do for you today?'}
 {'role': 'SYS', 'utterance': 'I need to buy a new refrigerator today.'}
 {'role': 'USR', 'utterance': 'Were you looking at a particular refrigerator?'}
 {'role': 'SYS', 'utterance': 'I like that Kenmore refrigerator.'}
 {'role': 'USR', 'utterance': 'This particular refrigerator is a very good choice.'}
 {'role': 'SYS', 'utterance': 'Tell me about it.'}
 {'role': 'USR', 'utterance': 'Not only is it affordable, but it comes with all the appliances.'}]
{'role': 'SYS', 'utterance': 'What are the appliances.'}