So, Bobby came to my office today because he'd heard I had openings. Actually I had filled all my positions, but even if I had not, I would not offer Bobby a job. My normal approach in this situation would be to tell the applicant I had no intention of hiring that I would keep his application on file for future openings.
But today I said this to Bobby: "You know, Bobby, you were an employee of mine 5 years ago. I sent you to a job to unload a truck in a town 2 hours away. You decided to leave before the truck driver got there even though I asked you to stay. You've proven yourself to be undependable to me. I can't imagine a situation that I would ever feel comfortable offering you a job."
And then Bobby thanked me and left.