I'd really like to know what airline had an employee doing this, so I can make sure to never do business with them again.

So the airline sells a last minute ticket and after the customer pays, the airline's agent initiates steps to coerce the ticket holder from enjoying the travel he just purchased. All in the name of profit. Sounds unfair, deceptive and damaging to me, exactly the sort of thing that ruins reputations and balance sheets.

My guess is all of them.