I needed to change my return flight date, which I gave plenty of notice for and is feasible. However, I was informed that the airline needed to do it but when I asked the airline they said Travel Up had to do it as they manage the booking which makes sense. After repeated attempts with Travel Up to change the flight, they just kept saying the airline needed to do it. It must be possible for Travel Up to liaise with the airline to make the change but they essentially refused to help me. Obviously will not be using them again in the future, as they have terrible customer service.