Probably you made the mistake of saying the word "change". If you want to change your ticket, i.e. get a guaranteed seat on a different flight, that costs mone

Probably you made the mistake of saying the word "change". If you want to change your ticket, i.e. get a guaranteed seat on a different flight, that costs money. If you had asked to standby for the earlier flight, you would almost certainly have been told "ok we've put you on the list; check at the gate" with no charge.