Free Flight Is Counting the Days

In June this year I won a return ticket on airphilexpress KUL-MNL-KUL and has yet to be claimed. The certificate is valid until Dec 15 2012.

From 29 October till 15 November 2012 the last day the ticket is valid I will be occupied and will not be able to fly to Manila.

On this date that I make a "trial booking" the price for return flight (KUL-MNL 15 Nov MNL-KUL 18 Nov)  is PH9626 (RM709.709). Wondering can I sell it off for 50% of it?