Situation 1    An old man is carrying a very heavy suitcase.

Example:   PAUL:  Excuse me, sir. That suitcase looks very heavy.
                  Would you like me to help you with it?
                  OLD MAN: Yes, please. It’s very heavy. Thank you. That’s       
                  very kind of you.
                  PAUL: Not at all. Is there anything else I can do for you?   
                  OLD MAN:  No, thank you. Thanks for all your help.