Phone call: Can you do xyz burger place for lunch by Sunday for $10 plus reimbursement
Me: No, sorry but I'm not available
Caller: How about for dinner
Me: No, I'm not available
Caller: So you won't have any time in the next three days
Me: That's correct, I'm not available
Caller: Oh, not even for either dinner or lunch
Me: That's what not available means
Caller: You can choose either lunch or dinner
Me: (STILL trying to be cordial) Well, not available really does mean not available
Caller: ------silence------ Oh, well, okay, I guess you aren't able to help us then.