Small green budgie with yellow face and red leg band

I live in Altoona and I'm missing my little green budgie. Yesterday around 3pm, he slipped from his cage on the living room windowsill when the door opened, and I haven't seen him since. He's palm-sized, with a bright green body, a yellow face, blue-tinted wings, and a distinctive red leg band marked 428. He’s tame, loves to chirp, and responds to the name Mango. I last spotted him near the CVS on Plank Road in Altoona, and I’m really hoping he finds his way back home—this bird is a part of our family and my son is heartbroken. If you spot him, text me at 555-0140 or email [email protected].