[{'role': 'USR', 'utterance': 'Taxi! Taxi!'}
 {'role': 'SYS', 'utterance': 'Where to, sir?'}
 {'role': 'USR', 'utterance': "I'd like to go to the railway station please."}
 {'role': 'SYS', 'utterance': 'Please hop in.'}
 {'role': 'USR', 'utterance': 'Is it a long run to the station?'}
 {'role': 'SYS', 'utterance': "It'll take about 20 minutes."}
 {'role': 'USR', 'utterance': 'The streets are heavy with traffic at this time of a day, are they?'}]
{'role': 'SYS', 'utterance': 'Yes, they are.'}