I booked 2 tickets for my wife and daughter 4 months ago Sydney fukuoka from 21 sept return 6th oct on jal .I rang and wanted to change the tickets to dec 30th return 14th jan same route I was also going to purchase a ticket for myself in dec same date. flight centre quoted aus$ 550 each ticket to change the date to dec aus $aus1100 all up is this standard change of date price any info appreciated. at this price ill just leave it