How...How Do You Function?!

So we make pizza's where I work and customer's can pick up whole pizza's to go...if they give us enough time to make them. Apparently, this lady doesn't understand this concept...

*Customer walks in at about 10 of 7*

Customer: Yes, how long is it going to take for the breakfast pizza to finish?

Me: Oh just a few minutes. You want me to ring you up for a slice?

Customer: Actually, I have a meeting and I need the whole thing. Well, multiple pizza's actually.

Me: Oh okay. What time do you need them for?

Customer: 7:00.

Me: ...That's not possible ma'am...

Customer: Well why not?!

Me: ...Because it takes at least 10 minutes to cook each pizza.

Customer: Well I called *names another store of ours* and they said you could make pizza anytime!

Yeah...that really happened...