Danny Ainge has denied trying to trade Rajon Rondo, and two league sources corroborated his stance by dismissing a report that the Celtics president discussed a deal that would send Rondo to Dallas. "The Celtics haven't had any conversations with Dallas about Rondo," said one source. "That's ridiculous. There's no truth to it. What in the world does Dallas have to offer for Rondo?"A second source refuted the report by pointing to the state of the Mavericks roster."They're trying to rebuild around a 37-year-old Dirk Nowitzki," he said. "They have a lot of old expiring contracts, and that's about it."