My favorite response to being asked to do something that simply can’t be done is when ATC tells Captain Sullenberger to head to Teterboro — they have a runway available for him. His simple response: “Unable.” I tried that a few times, it didn’t work it seemed. So now I have created a shortcut for the letters “unab” in my iPhone that automatically spell out “Unable at this time but appreciate your reaching out. Thank you.” Some aggressive sales people will ask for a later date to which I don’t respond. It feels harsh at times but accomplishes my goal of being responsive but not sabotaging my priorities at the same time.