Bill, please.
Please wait a moment. . . here is the bill. Please check it.
Excuse me, what's this item for?
For three bottles of Tsingtao beer.
But we've can canceled one bottle.
Oh, I'm sorry. Let me go back to the cashier's to have it changed. ( a few minutes later, the waiter returns with the new bill. )
I'm sorry for the miscalculation. Here's the new bill. Would you mind checking it again?
That's all right.