Lost green parakeet named Charlie in the Sunset Park area of Bloomington-Normal, Illinois.

I lost my green parakeet, named Charlie, in the Sunset Park area of Bloomington-Normal. He flew out of the window when I was cleaning his cage, and I've been searching everywhere since. Charlie is very friendly and loves to chirp, so if you hear any unusual bird sounds in the park, it's probably him! I'd really appreciate any help in bringing him back home.