[{'role': 'USR', 'utterance': 'Can I help you?'}
 {'role': 'SYS', 'utterance': 'Yes. When is the next train to New York City?'}
 {'role': 'USR', 'utterance': 'Let me see. . . the train to New York City. . . here it is. . . daily except Sunday at ten thirty, twelve twenty and fifteen ten.'}
 {'role': 'SYS', 'utterance': "Aren't there any trains before ten thirty?"}
 {'role': 'USR', 'utterance': 'Sorry, not before ten thirty.'}
 {'role': 'SYS', 'utterance': 'Then one to New York at ten thirty.'}
 {'role': 'USR', 'utterance': 'One way or round trip?'}]
{'role': 'SYS', 'utterance': 'One way.'}