I have a domestic red e-deal return ticket that I might have to cancel. (Class O one way, Q the other, booked via the Qantas website). I gather that I can cancel this and get credit for a future flight (with a fee of $88?). Is that correct? Can I just click cancel on the manage your flight page and the credit voucher will be created, or do I need to use the phone booking (for a fee) and/or actually book the next flight? Can the credit voucher be used for more than one flight (ie book one flight less than the voucher and use the residual for another flight)?