I have two plane tickets for London - South America with one stop. For reasons that aren't relevant, my companion won't be able to make it, so the seat will be completely empty.
I'm almost certain because of the fare I paid the ticket can't be exchanged or refunded or anything, so I'm basically stuck with a very expensive empty seat next to mine.
What can I do with this? Ideally I'd like to somehow get part of the money back, but I'm open to ideas about how to use it to make my trip more comfortable if I can't do anything else with it.