[{'role': 'USR', 'utterance': 'Do you know anything about health food?'}
 {'role': 'SYS', 'utterance': 'It is so popular among people to preserve health now, so I read some books about health food.'}
 {'role': 'USR', 'utterance': 'Can you give me some examples?'}
 {'role': 'SYS', 'utterance': 'Drinking warm and fresh water in the morning on wakening up is one of ways to keep healthy.'}
 {'role': 'USR', 'utterance': 'Really? Why we must have warm and fresh water?'}]
{'role': 'SYS', 'utterance': 'Warm water can be good for your stomach, which is empty at that moment. And freshness can keep the water active to clean your digest system.'}