[{'role': 'USR', 'utterance': "The Johnsons are on their way back. You remember them, don't you?"}
 {'role': 'SYS', 'utterance': "Johnson? I can't place them."}
 {'role': 'USR', 'utterance': 'We met them in Bermuda last May.'}
 {'role': 'SYS', 'utterance': "They've completely slipped my mind."}
 {'role': 'USR', 'utterance': 'The couple with the dogs-think back.'}]
{'role': 'SYS', 'utterance': "No, I don't recall a thing about them."}