When we pray according to God's promises and seek His will for our lives, then all of our requests will be granted.  As long as we seek His will with all of our hearts and rely on His purpose rather than our own strength.  Utilizing patterns of prayers such as the A.C.T.S. model can help us focus on what God truly wants to do in us and through us.  In the end, prayer is not how we change God's mind but how we align ourselves to His will!  1 Timothy