[{'role': 'USR', 'utterance': 'Can I help you, sir?'}
 {'role': 'SYS', 'utterance': 'Yes, what sort of warranty comes with this stereo?'}
 {'role': 'USR', 'utterance': 'Well, our store offers a 90 - Day return policy and the manufacturer offers a one-year warranty on any factory defects.'}
 {'role': 'SYS', 'utterance': 'What conditions are there on the store policy?'}
 {'role': 'USR', 'utterance': "We'll give you your money back as long as the stereo is returned in the original packaging and with a receipt."}]
{'role': 'SYS', 'utterance': "O. K. How do I get the manufacturer's warranty?"}