[{'role': 'USR', 'utterance': "What's wrong with you?"}
 {'role': 'SYS', 'utterance': "I'm trying to send the instruction book by E-mail, but I failed many, many times. And there is something wrong with the net maybe. It's so slow."}
 {'role': 'USR', 'utterance': 'Well, maybe the net is slow now. Try it again.'}
 {'role': 'SYS', 'utterance': 'I am used to editing with Word 2003, and there are many pictures in the book.'}
 {'role': 'USR', 'utterance': "It's beyond question. You can save it the same as a document."}
 {'role': 'SYS', 'utterance': 'I merely know how to send the direct letter. But I am not familiar with the attachment.'}
 {'role': 'USR', 'utterance': "It's the same as usual. The only difference lies in that you need to paste the book as an attachment."}]
{'role': 'SYS', 'utterance': 'Can I mail the book if it is a large file?'}