[{'role': 'USR', 'utterance': 'Excuse me. Does this bus go to the National Library of China?'}
 {'role': 'SYS', 'utterance': 'Yes, there are three stops left.'}
 {'role': 'USR', 'utterance': 'How long is the ride?'}
 {'role': 'SYS', 'utterance': "Well, you will get there in about a quarter of an hour if the traffic isn't too heavy."}
 {'role': 'USR', 'utterance': "Thank you. Would you please let me know when we get to the stop? I'm a stranger here."}]
{'role': 'SYS', 'utterance': "Sure, madam. I'll remind you."}