I struggled to get a flight back to the UK for next week. Flights were disappearing from Thomas Cook, Thomson & Monarch sites between hitting the "book" button & getting to the payment screen. I looked at just about every UK airport & Antalya as well as Dalaman & there was nothing cheap. I think it may be a knock on effect of Aegean going down, as I know several people that came out on one way tickets & have been looking for their returns in the last few days.
If you can't secure a resale ticket in the next 24 hours or so, you'll be too late to do a name change, as Thomas Cook won't accept name changes less than 4 days before flying.
Good luck