Gray cockatiel with yellow crest, lost yesterday

I lost my gray cockatiel yesterday around 3:00pm near Water Street by Riverside Park in Elmira-Corning. It's a mature male, about 12 inches from beak to tail, with a bright yellow crest and orange cheek patches. The body is mainly gray with white-tipped tail feathers, and one of the left wing feathers has a tiny white feather that sticks out a bit more than the rest. He typically perches on my shoulder and answers to the name 'Sunny' when I whistle. This bird has sentimental value — he's been with me since last year and helped me through some tough times. If anyone sees him in the trees around Corning's Market Street or Elmira's Water Street, or hears a cheerful chirp, please contact me. I’m really worried and would be forever grateful to get him back.