[{'role': 'USR', 'utterance': 'Kate, can we change the channel?'}
 {'role': 'SYS', 'utterance': 'Why?'}
 {'role': 'USR', 'utterance': "This channel has so many advertisements, and it doesn't have any good TV programs."}
 {'role': 'SYS', 'utterance': 'OK. You can change it.'}
 {'role': 'USR', 'utterance': 'What about this one? Do you like this program?'}
 {'role': 'SYS', 'utterance': 'No, I think it is very boring. Can you change it to Channel Twelve, please?'}
 {'role': 'USR', 'utterance': "Yes. Oh, it's a talk show."}]
{'role': 'SYS', 'utterance': "Yeah, it's very funny. Have you ever watched it before?"}