I'll chime in. I just received a full refund of two tickets to Spain due to a schedule change. The agent, who handled this very well, first asked if we wanted to change to flights within a day before or after, free of charge. I said we didn't know what we wanted to change to and if we could just refund. The schedule change had turned a BCN-ATL-MSN connection into 46 minutes, with the next option being a 6 hr layover in ATL. Asking nicely and having a plan is the best approach.