[{'role': 'USR', 'utterance': 'May I help you?'}
 {'role': 'SYS', 'utterance': "Yes. I'd like to send this parcel to Changchun."}
 {'role': 'USR', 'utterance': 'How do you want to send it?'}
 {'role': 'SYS', 'utterance': "I guess I'll send it by airmail."}
 {'role': 'USR', 'utterance': 'Is there anything valuable?'}
 {'role': 'SYS', 'utterance': 'No, there are only some vases.'}
 {'role': 'USR', 'utterance': "They are fragile articles. They must be packed in a proper strong box. Your light cardboard box won't do."}
 {'role': 'SYS', 'utterance': 'Have you got boxes for sale?'}
 {'role': 'USR', 'utterance': 'Yes.'}
 {'role': 'SYS', 'utterance': 'Is it all right this time?'}
 {'role': 'USR', 'utterance': "Yes. Now fill in two customs declarations and one despatch note in English. You'll have to take your parcel to the next window for examination when you have completed the forms."}
 {'role': 'SYS', 'utterance': 'OK.'}
 {'role': 'USR', 'utterance': 'Have you written down your return address?'}]
{'role': 'SYS', 'utterance': 'Yes, I have.'}