Bill , please .
neutral
user
Please wait a moment ... here is the bill . Please check it .
neutral
assistant
Excuse me , what's this item for ?
neutral
user
For three bottles of Tsingtao beer .
neutral
assistant
But we've can canceled one bottle .
neutral
user
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 . )
neutral
assistant
I'm sorry for the miscalculation . Here's the new bill . Would you mind checking it again ?
neutral
user
That's all right .
neutral
assistant