Oktoberfest flight tickets ?

My boyfriend and I have bought tickets to Munich are now not able to go. Flights are 250 for two tickets return. Flights details are as follows: London Gatwick (South Terminal) to Munich Dep 01 October 2012 18:35 Arr 01 October 2012 21:25 Flight 5385 Check in opens 01 October 2012 16:35 Check in closes 01 October 2012 17:55 Munich to London Gatwick (South Terminal) Munich to London Gatwick (South Terminal) Dep 09 October 2012 17:20 Arr 09 October 2012 18:10 Flight 5384 Check in opens 09 October 2012 15:20 Check in closes 09 October 2012 16:40 Please email asap. Thanks, Victoria