15-Intercessor Prayer Challenge: Day 15

It’s sometimes easy to fall into the trap of thinking, God knows my every thought and all my needs. He loves me and has promised to care for me. So why do I need to pray? If God is immutable (without changing) and He is eternal and omniscient (knowing the beginning from the end), then why should I ask for something He might not be willing to give me? Or why would I tell Him about things He already knows? Why should I tell Him of my cares, if I trust He is good and cares for me?