Trust issues?

Customer: I ordered a book and I want to see if you really ordered it.
Me: okay....
Customer: I thought it would be in by now so maybe you didn't actually order it for me.
Me: Ummm okay, let me get your name.
Customer gives me her info and I look up the order.
Me: It has been ordered for you. I can see here that it has been shipped so we're just waiting for it to arrive.
Customer: So you did order it.
Me: Umm yes. We generally do order things when we say we did....


?