Receipt Printer

It took me awhile yesterday inside the grocery store because of their receipt printer ran out of paper. If i was only being told what was the problem, then i could've just told the cashier to forget it and don't bother giving me the receipt anymore since i was in a hurry so i can go home right away to prepare some dinner for my family. It was not a big deal but then she did not tell me that it was only my receipt. If i had known that before she told me, i could've just left the store and let her fix the machine.