[{'role': 'USR', 'utterance': 'What seems to be the problem?'}
 {'role': 'SYS', 'utterance': "I have a really bad toothache! My cheek is swollen and I can't eat anything."}
 {'role': 'USR', 'utterance': "Let's have a look. Mmmm. This doesn't look too good. I think we may have to pull out your wisdom tooth. It's pressing against your molars and that's one of the reasons you are experiencing so much pain"}
 {'role': 'SYS', 'utterance': 'When you pull my tooth will you also have to extract the nerve and the root?'}
 {'role': 'USR', 'utterance': "First we will take some x-rays and see what we're dealing with. I also noticed a small cavity up front here, so you are going to need a filling."}]
{'role': 'SYS', 'utterance': "I guess that's what I get for not flossing or brushing my teeth three times a day."}