Prayer opens our lives for God so his will can be done in and through us, because in true prayer we habitually put ourselves into the attitude of willingness to do whatever God wills.
God is not a cosmic bellboy for whom we can press a button to get things.
In the foothills of the Himalayas, one hears the prayer: "Oh Lord, we know not what is good for us. You know what it is. For it we pray."