Task: Question Answering
Input (English): Context: At the parking structure Viv got a lot of the new dollar coins after paying for parking . They 're very shiny ! We kept M company while she paid and then we off to the vehicles . I was riding with Viv and we were going to pick up Joe at Vienna Metro . 
Question: What may be the reason for her getting dollar coins back ?
Output (English): Because she over paid in cash .