2x tickets to Berlin 6/7-8/7 with easy jet ?

Hi there, We have two tickets for Berlin going- we were suppposed to be going for a concert which has been postponed, so we are not going later in the year. The price is what we paid for the tickets. I think you need to pay extra to change the names. Open to a little negotiation, but not much. Details as follow: London Gatwick (South Terminal) to Berlin Brandenburg Dep 06 July 2012 19:55 Arr 06 July 2012 22:50 Flight 5417 Check in opens 06 July 2012 17:55 Check in closes 06 July 2012 19:15 Berlin Brandenburg to London Gatwick (South Terminal) Dep 08 July 2012 21:05 Arr 08 July 2012 22:00 Flight 5416 Check in opens 08 July 2012 19:05 Check in closes 08 July 2012 20:25