Making dialogue

There are expressions of offering, Accepting, Refusing service

Offering service	Accepting service	Refusing Service
What can I do for you?	Thank you	No, thank you
Can I help you?	That's very kind of you.	That's very kind of you, but .....
Can I do something for you?	Oh, yes, please.	Thank you for offering, but .....
Do you want something to..?	Thank you very much	No, it's all right, really
Shall I get you something to..?	Lovely	No, really, I can manage myself