Hi. You dont say how big the dent is, if it is only a small one try finding some wood of the same kind, ie colour, then saw this up to create sawdust, collect the sawdust and mix it with wood glue thus making a paste and use this as filler.
The wood glue dries almost clear and so the colour match is not far off. I used Evo-Stick wood glue on a door and you can hardly notice the repair.