[{'role': 'USR', 'utterance': 'Dental clinic. This is Mr. Adams.'}
 {'role': 'SYS', 'utterance': "Hi. My name's David Johnson. I'd like to make an appointment."}
 {'role': 'USR', 'utterance': 'All right, David. Is this for a checkup or a cleaning?'}
 {'role': 'SYS', 'utterance': 'A checkup. I think I have a bad cavity. Half the side of my head hurts.'}
 {'role': 'USR', 'utterance': 'What tooth is giving you pain?'}]
{'role': 'SYS', 'utterance': 'One of the back ones.'}