Counter guy: OK, it will be ready on Tuesday.
Me: Oh ... Tuesday? It's not possible to get it back Saturday sometime?
Counter guy: No. [Here he gave an explanation of why which I omit.] Although ... it could be ready for Monday if you need it then. Should I put you down for Monday or Tuesday?
Me: Neither is of any use to me.
Counter guy: OK, I'll put you down for Tuesday then.