In a large mixing bowl, beat cream cheese, milk and dill until blended. Stir in the ham, onion, celery and pimientos. Roll out pizza dough into a 12-by-10-inch rectangle; cut in half lengthwise and widthwise.
Place on baking sheet coated with nonstick 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 degrees for 20-25 minutes or until golden brown.