Hi, Mike. I'm calling to ask if you'd like to come and have supper with us on Friday.
The day after tomorrow? I'm afraid I won't be able to. I have to work overtime on Friday, or else I'll have to work this weekend.
You work really hard. Then how about this Saturday evening?
I'm afraid I won't be able to make it then either. I promise Jenny I'd go to a movie with her this Saturday. How about this Sunday?