[{'role': 'USR', 'utterance': 'Can I help you?'}
 {'role': 'SYS', 'utterance': "I'm looking for a Sharp DVD Player."}
 {'role': 'USR', 'utterance': 'Sure. Any particular model?'}
 {'role': 'SYS', 'utterance': 'Yes. The DS102 series.'}
 {'role': 'USR', 'utterance': "Oh, I'm afraid we've sold out of those. They were really popular."}]
{'role': 'SYS', 'utterance': 'Will you be getting more in.'}