For a compant like Servisair then the role of a dispatcher is to coordinate the turnaround of an aircraft. If things are going well then you will do very little but you need to be ready to resolve and problems that may arise. You will probably not be load control trained and so you will only have to pass figures and check hold loading with your ops who will do the loadsheet for your flight all you do is need to check the figures on it.
Thats about it