1 pound skinless, boneless chicken breast halves - cubed
1 cup sliced carrots
1 cup frozen green peas
½ cup sliced celery
⅓ cup butter
⅓ cup chopped onion
⅓ cup all-purpose flour
½ teaspoon salt
¼ teaspoon black pepper
¼ teaspoon celery seed
1 ¾ cups chicken broth
⅔ cup milk
2 (9 inch)  unbaked pie crusts