1.Certainly.You can.
2.By all means.
3.of course
4.Not at all.
5.No,of course not.
6.May I help you?
6.Is there anything I can do for you?
7.Can I assist you?
8.Would you mind if I.....?
9. I would appreciate it very much.
10. Please,thank a BT.
11. That's very kind of you. Than you.
12. If you don't mind. Than you very mach.