[{'role': 'USR', 'utterance': 'your mp3 looks so cool. Where did you get it?'}
 {'role': 'SYS', 'utterance': 'I bought it online.'}
 {'role': 'USR', 'utterance': 'really? Do you often shop online?'}
 {'role': 'SYS', 'utterance': 'yes. I buy most of my daily necessities online.'}
 {'role': 'USR', 'utterance': "I've never tried E-shopping. Is it better than shopping at an actual store?"}
 {'role': 'SYS', 'utterance': 'yes, much better. You can log in a website, browse through many items and categories comfortably at home, order the goods, pay by credit or debit card, and the goods will be delivered to your home.'}
 {'role': 'USR', 'utterance': "sounds good, and I don't have to queue up at the cashier."}]
{'role': 'SYS', 'utterance': "and you can still go ' window shopping ' just like in a real shopping mall."}