Today one of the Communion antiphon was based upon Mark 11.24, in which Jesus said to his disciples, "I tell you, all that you ask for in prayer, believe that you will receive it and it shall be yours." This is the key to having your prayer answered. Of course, what you ask for must be something you truly need or what your heart desires and not unreasonable or offensive to God. For example, I would not ask God to heal me instantly if I accidentally cut my finger a little bit. He handles cases that are too tough for us! Also, God may not answer you right away. If I pray for a loved one to return to the Catholic faith, it may not happen in my lifetime, but happen it shall.