Even after paying for Flexi booking, I was unable to change my booking because the bus had already left it's initial destination, over two hours before I was meant to get on. The information given when paying for Flexi-booking implies that I should be able to change my booking up to one hour before my departure time, not the initial departure time of the bus. This is badly explained on the website, and when I called the helpline, I was greeted with a rude and unhelpful employee who was blunt and showed no sympathy, even though the bus I wanted to change to wasn't due to leave for another four hours. I use Aircoach all the time to travel to and from Belfast and Dublin but will now look into using other companies to cover this journey in the future.