Help for my dad

Hey guys, Me and my dad have been skiing together for a while and this year since a family friend of ours are traveling the world and living for a month in utah we are going on a trip to ski there for sure. Well my dad has only skiing East Coast conditions ever since he started skiing. He is a good skier and can do like double black groomed trails on almost all east coast mountains but has never skiing in deeper snow or any type of powder at all. Once it did snow a couple of inches at Killington and he says his problem is he cant turn left at all im not sure why and it might just be because hes just not used to skiing in that kind of snow.