Preheat oven to 350 degrees. For an extra crispy crust, pre-bake flatbread directly on the rack in preheated oven for 3-4 minutes. Place flatbread on a baking sheet. Spread 2-3 tbsp pizza sauce on flatbread. Sprinkle 3 tbsp shredded mozzarella, 1 tbsp goat cheese crumbles over the sauce and then sprinkle a small amount of dried dill over the cheese. Bake for 5 minutes, until cheese is melted. Meanwhile, cut smoked salmon into small pieces. Once flatbread comes out of the oven, top with salmon pieces, 1 tbsp capers and another sprinkle of dill.