DALLAS TWP. — The Dallas School District does not have much left to offer the teachers’ union, district Solicitor Vito DeLuca said Tuesday. The school board and Dallas Education Association members met for 45 minutes Tuesday afternoon, but no proposals were exchanged. Instead, the district requested teachers return to their classrooms and have both parties enter voluntary non-binding arbitration, DeLuca said. “The union refused,” he said. Michael Cherinka, president for the Dallas Education Association, said the voluntary non-binding arbitration involves both sides agreeing to let a third party review proposals and develop an offer.