I'm curious to know how the the flight was paid for. Call back united and ask, what form of payment was used to make this booking. Or for all you know it was just put on hold and never paid for.
Or you just had a nice employee wanting to sponsor your flight.
Who knows, Maybe the caller ahead of you told them to sponsor the next person's flight, Whoever calls. (A Mr beast move.)
On the email with the flight confirmation from united it did say something about the form of payment, I will copy it here....
"Payment Info, Remaining value of your previous ticket numbers 0168093098487, 0168093098485 was applied to this purchase".
So it def seems like it was paid for, maybe after keeping me on the phone for an hour and then getting disconnected the agent felt bad... at this point it is clear that it is not a reservation on hold, my reservation is active.