In A Large Bowl, Beat Cream Cheese, Milk And Dill Until Blended. Stir In The Ham, Onion, Celery And Pimientos. Roll Out Pizza Dough Into A 12-In. X 10-In. Rectangle; Cut In Half Lengthwise And Widthwise. Place On A Baking Sheet Coated With Cooking Spray. Divide Ham Mixture Evenly Between The Four Rectangles. Fold Opposite Corners Over Ham Mixture; Pinch To Seal. Brush With Egg White. Bake At 400