thanks a lot多谢



i am very grateful to you非常感谢您



it is very kind of you您真客气



not at all不用谢



do not mention it 不用谢



my pleasure(with pleasure)不用谢



glad to be of service很高兴为您服务



at your service乐意为您效劳



i am terribly http://sorry.it is my fault非常抱歉，那是我的过错



i am awfully sorry for my carelessness对于我的粗心大意我非常抱歉



sorry to have kept you waiting对不起让您久等了



sorry to interrupt you对不起打扰了



that is all right这没什么



never mind不要紧



it does not matter没关系