Monarch flight from Alicante to Manchester .

I accidentally booked this flight the wrong way! I need to get back to Spain on Wednesday so need to sell this flight. The Flight is from Alicante to Manchester on Wed 1 August. I paid 72 for the flight but i would have to change the name to the buyers name which costs 100 so im selling the ticket for 170 which is still cheap at this time of year!