[{'role': 'USR', 'utterance': 'Excuse me, could you tell me where the nearest post office is?'}
 {'role': 'SYS', 'utterance': 'Yes, walk down this road and then turn left when you get to the third crossing. You will see it not far ahead of you.'}
 {'role': 'USR', 'utterance': 'Thank you. Could you give me more information?'}
 {'role': 'SYS', 'utterance': "Of course. When you turn left, you will see a five-star hotel with a tea shop on the left. The post office is just next to it. It's a three-storey building."}
 {'role': 'USR', 'utterance': 'How long will it take to get there if I walk?'}
 {'role': 'SYS', 'utterance': 'About 30 minutes?'}
 {'role': 'USR', 'utterance': "Oh, that's too long."}]
{'role': 'SYS', 'utterance': 'Uh, well, you can take bus 232 or get a taxi there.'}