Green cockatiel with orange cheeks and blue leg band

I lost my green cockatiel yesterday around 3pm after I stepped outside onto our apartment balcony in Burlington, Vermont. He’s the size of a palm, all green with bright orange cheek patches, a pale yellow crest, and a small blue leg band labeled 'B7' on his left leg. He responds to the name 'Zippy' and loves to chirp at familiar voices. Last I saw him, he was fluttering toward the Church Street Marketplace area, near the waterfront by the ECHO Leahy Center for Lake Champlain. This little guy has sentimental value to me and my family, and I’d be eternally grateful to get him back if anyone spots him.