[{'role': 'USR', 'utterance': 'ABC Rent-a-Car. May I help you?'}
 {'role': 'SYS', 'utterance': 'I would like to rent a car. What kind of car do you have?'}
 {'role': 'USR', 'utterance': 'We have Volkswagen, Pinto, Plymouth and Datsun.'}
 {'role': 'SYS', 'utterance': 'What is the rate?'}
 {'role': 'USR', 'utterance': 'Twenty dollars per day for Volkswagen, Pinto and Datsun, and twenty-seven dollars for Plymouth.'}
 {'role': 'SYS', 'utterance': 'How about mileage and gas?'}
 {'role': 'USR', 'utterance': 'There is no charge for mileage. And fill up the gas when you return the car to us as it is not included.'}]
{'role': 'SYS', 'utterance': "OK. I'll try a Pinto. I want to rent a car for one week."}