Found a bright green parakeet in a backyard in Southern Illinois, friendly and without identification tags.

I found a bright green parakeet fluttering around my backyard in Southern Illinois Yesterday afternoon. It seems well-cared for and is very friendly, clearly used to human interaction. I couldn't see any identification tags or bands, but I have put a little food and water out for it. I'm hoping to find its owner, as it must have flown away from home.