A: Oh, excuse me. I just spilled my coffee on your carpet.
B: Don't worry about it.
A: Anyway I want to pay for the cleaning.
       B: It's no big deal　

A: I have been waiting for Mr. T. Carpenter for thirty minutes.
B: I'm sorry, but he's still in a meeting.
A: Well, how much longer do you think he will be?
B: Oh, he should be finished soon.A: I'm sorry I got angry at you at the party.
B: That's too bad. Everyone will be disappointed.　

A: I'm sorry if I've caused any problem.
B: No, no problem at all.　

A: I'm sorry I'm late. Have you been waiting long?
B: No, I just got here.　

A: Oh, I'm terribly sorry, sir. Are you all right?
B: I'm all right. Don't worry.　

A: Ouch!
B: Oh, I beg your pardon.