[{'role': 'USR', 'utterance': 'Good morning. Could you tell me the times of trains to London, please?'}
 {'role': 'SYS', 'utterance': 'Yes. There are trains at 7:59, 9:18, and 10:32.'}
 {'role': 'USR', 'utterance': 'What time does the 7:59 train get to London?'}
 {'role': 'SYS', 'utterance': 'At 9:36.'}
 {'role': 'USR', 'utterance': "What about coming back? I'd like to come back at about 7 p. m."}]
{'role': 'SYS', 'utterance': "There's one at 7:10 p. m. and the next one is at 7:40 p. m."}