Yellow cockatiel lost near Echo Park Lake

I lost my yellow cockatiel yesterday around 3pm near Echo Park Lake, by the bridge at Sunset Boulevard. He’s a small gray bird with a bright yellow head, orange cheek patches, and a blue-tinged tail; he also wears a tiny silver leg band stamped 'LA-77'. He’s usually fluffy and chatty, and I’d recognize his whistle if you hear it. This bird is really special to me—it's a gift from my grandmother and has sentimental value. If anyone spots him, please message me—I’m really hoping to get him back.