[{'role': 'USR', 'utterance': "What's up, how are you?"}
 {'role': 'SYS', 'utterance': "I'm splendid. How about yourself?"}
 {'role': 'USR', 'utterance': 'Could be better.'}
 {'role': 'SYS', 'utterance': 'So, have you been on the bus very long?'}
 {'role': 'USR', 'utterance': 'I got on about fifteen minutes ago.'}
 {'role': 'SYS', 'utterance': 'How often do you ride the bus?'}
 {'role': 'USR', 'utterance': 'I usually just drive.'}]
{'role': 'SYS', 'utterance': 'You have your own vehicle?'}