You were working at an office, and it was your break time. You decided to exit the company building you work at and went to the coffee shop down the street. You arrived at the coffee shop, and waited in line. It was busier than usual, as it was lunch time on a weekday. When you were talking to the cashier about your order, you reached into your pocket and tried to reach for your wallet, when you realize you forgot it. You panicked, until a person behind you offers to pay. What do you do?