WASHINGTON, Sept 17 (Reuters) - The number two and three U.S. diplomats will hold bilateral talks with Iranian officials on Wednesday and on Thursday in New York, the U.S. State Department said. "Deputy Secretary of State William J. Burns, Under Secretary for Political Affairs Wendy R. Sherman, and Senior Advisor Jacob J. Sullivan will travel to New York for consultations with Iranian officials September 17-18," it said in a statement. ...