Green budgie with yellow head, blue leg band

I lost my green budgie with a bright yellow head yesterday around 3pm near the Denver Botanic Gardens, Cheesman Park area around York Street. He's small, about the size of a sparrow, and he wears a blue leg band on his left leg with 'D6' engraved. He has a tiny notch on the tip of his right wing. I've had him for over a year; he's a curious, chatty little guy and I'm really worried. If you spot him in the Denver Botanic Gardens/Cheesman Park area, email [email protected] so I can come get him quickly.