Based on the context and the answer, generate a question. 

Context: I was at the Car Pool getting Mrs. Astro 's car washed . I stood in front of the vending machine and decided I wanted a root beer . I reached for my wallet and started sifting through my receipts . I noticed I had two bills .

Answer:

He noticed he was thirsty and wanted some root beer to quench his thirst .



Why was the person in front of a vending machine ?