At the corner of Merchant and Battery Streets stands one Jackie Matiatos, a hostess behind a podium bearing the emblem of the dim sum restaurant that was once located there. "Sometimes nobody comes," Matiatos says forlornly. Three years after Yank Sing moved to the Rincon Center, you'd think the owners would have given up on lost customers. Yet, seven days a week at lunchtime, a hostess redirects customers to the current location. "There are always a few who need the assistance," says a supervisor. It appears the restaurant has unwittingly spawned yet another quirky fixture in an urban landscape famous for them.