docbert

As it's been explained to me, this is user error on behalf of the person in the booth. All of the reservations - including canceled ones - will show up on when they look, but they are only supposed to select non-canceled ones. If all of them are canceled, they aren't supposed to proceed without confirming what is going on first.

(To me that sounds far more like the fault of a bad system, but whatever...)

If I know I've canceled and rebooked, I normally make a point of pointing it out when I get to the gate by telling them there might be more than one reservation, but only one that's not canceled. If I have the number to hand, I'll even give them the last few digits of the confirmation number to make sure they get the right one.