[{'role': 'USR', 'utterance': "Look, George, There's the Great Wall."}
 {'role': 'SYS', 'utterance': "I see. It's on top of the hills."}
 {'role': 'USR', 'utterance': 'Yeah, it stretches over for thousands of miles.'}
 {'role': 'SYS', 'utterance': "I know. It's a major symbol of China."}
 {'role': 'USR', 'utterance': 'Where can we climb it?'}
 {'role': 'SYS', 'utterance': 'Do we have any choices?'}
 {'role': 'USR', 'utterance': 'Well, we could take the cable car.'}
 {'role': 'SYS', 'utterance': "Ah. . . let's just climb. It's more fun, I think."}
 {'role': 'USR', 'utterance': "Okay. Let's go."}
 {'role': 'SYS', 'utterance': 'Well, that was tough.'}
 {'role': 'USR', 'utterance': 'But we made it.'}
 {'role': 'SYS', 'utterance': 'This looks great. When was it built?'}
 {'role': 'USR', 'utterance': 'It was first built about twenty-five hundred years ago.'}]
{'role': 'SYS', 'utterance': "That's remarkable."}