[{'role': 'USR', 'utterance': "I really want to go to China for vacation, but I can't find a cheap plane ticket."}
 {'role': 'SYS', 'utterance': 'Have you tried the Internet?'}
 {'role': 'USR', 'utterance': 'No, not yet. Can you find a good price there?'}
 {'role': 'SYS', 'utterance': 'Wow, you really live in the Stone Age, Mom.'}
 {'role': 'USR', 'utterance': "Well, you don't have to be mean. How do I do it?"}]
{'role': 'SYS', 'utterance': 'Go to www. yahoo. com and click on Travel and tickets. There are about a billion sites to look at.'}