Preheat oven to 400ºF and lightly spray baking sheet with non-stick spray. Place salmon fillets on baking sheet and season both sides with salt and pepper. Drizzle both sides with olive oil and 1 tablespoon lemon juice. Bake for 13 to 16 minutes, or until cooked through. To check: gently squeeze the sides of the fillet. If it's still slightly squishy, cook for another 2 to 3 minutes; it shouldn't be hard to the touch. Remove salmon from oven and let rest 5 minutes. In a medium bowl, combine yogurt, mayonnaise and sour cream, and mix together. Then add dill, garlic, lemon zest and remaining lemon juice. Taste and add salt or pepper, if needed. Transfer to plates and serve, topped with dill sauce and fresh dill.