[{'role': 'USR', 'utterance': "Ah, that's the forth ad that appears suddenly on my computer screen since I started working on my paper."}
 {'role': 'SYS', 'utterance': 'You can buy an app that will stop those ads.'}
 {'role': 'USR', 'utterance': "I can't afford to buy some fancy $10 software just so I can write my paper."}
 {'role': 'SYS', 'utterance': "It's not that expensive. It's $1 per month."}
 {'role': 'USR', 'utterance': "So that's $12 a year."}
 {'role': 'SYS', 'utterance': 'Is it going to take you a whole year to finish that essay?'}
 {'role': 'USR', 'utterance': "Well, no, Harriet. It'll be done in 3 weeks. But I'll be doing school work on this computer for 4 years before I graduate."}]
{'role': 'SYS', 'utterance': "I think it's worth it, John. And if you spend $30, you don't have to pay the monthly cost."}