Sage Chapel at Cornell University was the setting Saturday at 1:30 p.m. for the marriage of Amy Murchison and Ralf Schlenker.The Rev. Rick Blair of St. Luke Lutheran Church, Ithaca, heard the vows of the daughter of Mr. and Mrs. Roderick Murchison of Orchard Park and the son of Mr. and Mrs. Rolf Schlenker of Schwenningen, Germany. A reception was given in A.D. White House at Cornell before the couple left for Dominica. They will live in Fairfax, Va. A graduate of Orchard Park High School and Miami University of Ohio, the bride has a master of business administration degree from Cornell and is a product manager with Cable & Wireless Inc., Vienna, Va. The bridegroom, a consultant for American Management Systems, Fairfax, is a graduate of University of Stuttgart, Germany, with a master's degree in aerospace engineering. He has an MBA with distinction from Cornell.