I think the best thing to do is speak to the agent who sold you the ticket. Most scheduled airlines sell a lot of tickets that are non-changeable and non -refundable meaning you can't amend the name of a person travelling or cancel for a full refund. This usually applies to lower priced tickets on the particular route. If you pay more (for the same flight) you can usually buy a ticket which will allow you to forfeit the first�100 for example and get the rest back. It really does depend on your specific ticket. Terms and conditions differ even on the same flight.