There are times and in the world it's unavoidable to ask for something personal. Many times while I was at prayer, I would keep asking for what seemed good to me. Swami Vivekananda says, never desire anything for, you will get it. And ultimately we actually get it and it does not turn out well.
"Do not pray for the fulfillment of your wishes, for they may not accord with the will of God. But pray as you have been taught, saying: Thy will be done in me (cf. Luke 22:42). Always entreat Him in this way - that His will be done. For He desires what is good and profitable for you, whereas you do not always ask for this." - Evagrius Ponticus.
Swami Sarvapriyananda speaks on Evagrius's teachings on prayer.