Offering

Offering help : 

1. May I help you ?
2. Can I help you ? 
3. What can I do for you ?
4. Would you like  any help?
5. is there anything I can do for you?
6. do you want me to.......
7. Would you like me to...........
8. If you like, I could ...........
9. Let me..............?
10. Let me do it for you

Your Responses Accepting :

1. Yes, Please
2. If  you don't  mind.
3. That Would be lovely.
4. That's very kind of you

Your Responses Refusing :

1. No, Thanks.
2. No, it's all right.
3. Thank you for offering, but.............
4. That's very kind of you, but.............