[{'role': 'USR', 'utterance': "Let's have a look at the map first."}
 {'role': 'SYS', 'utterance': 'All right. Wukesong stop is quite a few stops from here.'}
 {'role': 'USR', 'utterance': "Let's buy some tickets."}
 {'role': 'SYS', 'utterance': "The train is coming. There are a lot of people waiting here. let's stand in a better position to get on the train"}
 {'role': 'USR', 'utterance': "Well, it's not as crowded as we expected, is it?"}]
{'role': 'SYS', 'utterance': "No, but it will be soon. Look, there're two empty seats over there. Let's get them."}