[{'role': 'USR', 'utterance': 'Can you effect shipment during September?'}
 {'role': 'SYS', 'utterance': "I don't think we can make it."}
 {'role': 'USR', 'utterance': 'Then when at the earliest can we expect the shipment?'}
 {'role': 'SYS', 'utterance': 'By the middle of October.'}
 {'role': 'USR', 'utterance': "It's too late. You see, in our market October is the season for the kind of commodity. So the goods must be shipped before October or we won't be ready for the season."}]
{'role': 'SYS', 'utterance': "Well, considering our long standing good business relationship, we'll try hard to negotiate with our manufacturers for an earlier delivery."}