Upvote:2
It is normal that airlines never return your money; the best you can hope for is to be able to rebook for other flights on other days, within a year. Most airlines takea fee for that too, but some don't.
I think the best you can get is rebooking the flights within the 365 days, which could also be to another location, and you would do that with the airline. If you don't need/have to fly at all for the next 365 days, you could be able to transfer them to another person (a friend or relative), but that is at the airlines goodwill. You are not officially allowed to sell them to strangers (but be aware that the airline can't know who is your friend and who not...). This would loose some money of course, so it's only a partial recovery.
In a nutshell, airlines follow the Ferenghi rule of aquisition #5: Once you have their money, never give it back.