If there are no business reward seats when they are release, if I buy a PE reward seat and a business one later comes available, can I exchange directly over the phone? Or do I need to arches the new business one and get a refund on the PE one as separate transactions? Need to know as an exchange would hopefully allow me to just add the extra points(22000) but the former requires me to have spare 94000 before I get the 72000 refunded back?