chat_history: ['I bought a raffle ticket for a charity where I have a 1/500 chance of winning a car', 'Oh nice! That seems more likely than winning the state lottery. That would be so cool if you won!', 'Yes.  They were $100 but they only sell 500 tickets.  And the money raised goes to breast cancer research']
sys_response: That sounds like a really nice program. Where can I buy some tickets?!
situation: I bought a ticket where I have a 1/500 chance of winning a car