Good morning , can I help you ?   Yes , I'd like to check out .   Yes , of course sir . What's your name and your room number , PLS ?   Jack Remington , room 1408 .   Ok , here is your bill , Mr . Remington .   Which of these is my bill ?   Oh , I am sorry sir . I forgot to explain that to you . This one is an allowance slip . We made a mistake in your bill and overcharged you 120 dollars . So we had to write up an allowance slip and deduct 120 dollars from your bill . 