[{'role': 'USR', 'utterance': 'Hello,this is Susan speaking. Is Mr. Brown in, please?'}
 {'role': 'SYS', 'utterance': 'Yes, speaking.'}
 {'role': 'USR', 'utterance': 'Hi,Mr. Brown. Your son Ted missed the school trip this morning. Do you know why?'}
 {'role': 'SYS', 'utterance': 'Yes. He got up a bit late this morning. He missed the school bus.'}
 {'role': 'USR', 'utterance': "Why did he get up late? Didn't he have a clock?"}
 {'role': 'SYS', 'utterance': "The clock didn't work this morning. I worked overtime till midnight at home last night, so I got up late,too. It was already nine o'clock when I woke him up."}
 {'role': 'USR', 'utterance': 'Well,why did he wake up at such a late hour? Did he go to bed late last night?'}]
{'role': 'SYS', 'utterance': "Yes. He didn't go to bed until 11:00 pm."}