[{'role': 'USR', 'utterance': 'What kind of car is best for me?'}
 {'role': 'SYS', 'utterance': 'For you, I would recommend this one here.'}
 {'role': 'USR', 'utterance': 'The compact? Why do you think that one is better than the others?'}
 {'role': 'SYS', 'utterance': 'This automobile is just right for your needs because not only is it compact for ease in city driving, but also, it has many safety features. I know that as a parent, you are concerned about safety in driving your kids to and from school.'}
 {'role': 'USR', 'utterance': "That's true. What kind of safety features are we talking about?"}
 {'role': 'SYS', 'utterance': "This model features anti-lock brakes, airbags on both driver and passenger sides, and impact collision design. But that's not all. This car isn't only safe but it's also very economical."}
 {'role': 'USR', 'utterance': 'You mean it has a cheaper price than similar models?'}]
{'role': 'SYS', 'utterance': "Yes, this price is very affordable, but driving this car you'll also notice a significant annual saving in gas consumption. The main attraction for this model is the fuel economy."}