My mum entered into a verbal agreement with an ex boyfriend (boyfriend at the time) to pay for his airfare to travel with us which he agreed to pay back. Total amount was $2,000. No contract was drawn up and signed (wish I did now though) but I have text messages and emails acknowledging that it was a personal loan and that he is required to pay back the money but refuses to. Is there any way for me to get this money back? The airline doesn't provide a refund for a 'change of mind' and the ticket was non-refundable and non-transferable.