[{'role': 'USR', 'utterance': 'Thank you. The tea smells good. What is it called?'}
 {'role': 'SYS', 'utterance': "It's called Tie Guanyin, and is a kind of Wulong tea."}
 {'role': 'USR', 'utterance': "I've heard this name before, but I could never understand the tea classification."}
 {'role': 'SYS', 'utterance': "It's confusing and there is no agreement on it. Generally speaking, there are 4 kinds of tea based on processing methods. They're green tea, black tea, Wulong tea and scented tea."}
 {'role': 'USR', 'utterance': "It is said that different kinds of tea have different health benefits, isn't it?"}]
{'role': 'SYS', 'utterance': 'Yes, it is. But there are also considerations of time and personal health. For example, green tea is good in summer. It seems to drive away the heat and bring a feeling of relaxation. However, pregnant women should not drink it.'}