Found green parakeet near River Walk, San Antonio

Found a small green parakeet this afternoon around 3pm along the San Antonio River Walk near La Villita. It's about the size of my palm, bright emerald feathers with a yellow belly, and a blue patch on the wings. It has a white ring on its left leg and a tiny chipped beak from a sidewalk scrape, which makes it easy to distinguish. I picked him up after he perched on my shoulder and calmed down once I offered some water from a bottle. I'm keeping him safe in a cardboard bird carrier and would love to reunite him with his owner—someone must be missing a bright, talkative buddy.