Single Flight from London Heathrow to Lima, Peru (dates and name changes flexible) .

Hi all. I recently travelled to Peru to hike to Machu Pichu. My flight from Cusco to Lima on the way home was cancelled due to bad weather which meant I missed my KLM connecting flights. This meant having to buy new flights the next day to get home to the UK. A single flight home cost £1300 or a return £1000. Obviously I bought the return as it was cheaper. This now leaves me with the return flilght back to Lima Peru which is not going to be used on 30th November. Single flights to Lima currently cost £620 for 30th November. I am offering my KLM flight from Heathrow to Peru for £495, including name and date changes(£75 per change). Obviously if you wanted to travel at peak times ie christmas day then date changes may cost me more but I can check upon request. Price is negotiable for sensible offers. Let me know, Tom