[{'role': 'USR', 'utterance': 'Is this seat taken?'}
 {'role': 'SYS', 'utterance': 'No. Please sit down.'}
 {'role': 'USR', 'utterance': 'Thanks.'}
 {'role': 'SYS', 'utterance': 'Are you also going to Beijing?'}
 {'role': 'USR', 'utterance': 'Yes, on a business trip. How about Yuu?'}
 {'role': 'SYS', 'utterance': "I'm taking a vacation to visit a friend there. Have you ever been there before?"}
 {'role': 'USR', 'utterance': 'Yes, I Went there once last summer.'}
 {'role': 'SYS', 'utterance': 'Really? What did you think?'}
 {'role': 'USR', 'utterance': "I think it is amazing. You can enjoy both the traditional Chinese culture as well as the vitality of a modern cosmopolitan city. The only thing I didn't enjoy was the subway."}
 {'role': 'SYS', 'utterance': 'Was it that crowded?'}
 {'role': 'USR', 'utterance': "Yes. These were always so many people. After taking the subway during the rush hour, you'll envy sardines in their cans."}
 {'role': 'SYS', 'utterance': 'Oh, maybe I can take the bus or even rent a car.'}
 {'role': 'USR', 'utterance': "That's a good idea. Wish you a great vacation!"}]
{'role': 'SYS', 'utterance': 'Thank you very much!'}