Look what you've done!
I'm very sorry, sir. I'll bring you a cloth immediately.
Yes, and hurry up!
I'd like to apologize for my carelessness. May I clean it up for you?
No, I'll do it myself.
Here is my card, sir. Could you send me the cleaning bill and I will refund the cost to you?
I should think so, too!
I'm very sorry to have caused you this trouble.
Yes, and please be more careful in the future!
I will, sir. I'm really very sorry.