In several of the parables of Jesus, it would seem we must draw near to God with a determination to obtain the things we seek and not be put to shame by the seeming refusal or delay on God's part.
Consider the case of the Syro-Phoenician woman, Jesus seemed to put her request down with an uncharacteristic rudeness. Yet she continued to persist with the request. Finally, Jesus replied, "O woman, great is thy faith; be it unto thee as thou wilt." Matthew 15:28.
God does not always give us what we want at our first request. Rather it seems God trains us to work harder for the best things. He compels us to pray with determination. We need to keep hammering away at our prayer request until we obtain what we have requested.