[{'role': 'USR', 'utterance': 'Ah, where am I?'}
 {'role': 'SYS', 'utterance': 'Excuse me, do you need any help?'}
 {'role': 'USR', 'utterance': "I want to go to the Science Museum. But I've been lost for the past few hours, and I can't use these ticket machines."}
 {'role': 'SYS', 'utterance': 'Uh, well, just press this button of the ticket machine, then, get on the train at platform number four.'}
 {'role': 'USR', 'utterance': 'All right, oh, and how often do the trains come around this time of day?'}
 {'role': 'SYS', 'utterance': 'Usually they come about every 6 minutes.'}
 {'role': 'USR', 'utterance': 'Ok, and where do I get off the train?'}]
{'role': 'SYS', 'utterance': 'Get off at State Street Station, 3 stops from here.'}