Small green parakeet with yellow head, lost

I lost my little parakeet, a small green budgie with a bright yellow head, yesterday around 3pm. He slipped out the open kitchen window near the Corvallis Public Library on Monroe Ave and vanished into the trees along the sidewalk. He has a blue tail and a tiny silver leg band on his right leg with the number 42A. He’s chatty and loves mimicking a few phrases, so you’ll hear him before you see him. He means a lot to me—this bird has sentimental value and I’d be beyond grateful to have him back.