trying to SDC my flight for tomorrow to a better option that leaves slightly later in the day. Routing is CVG-ORD-XXX-HNL. My original flight is a 6am and the option i wanted to SDC to starts at 10:56am. UA agents keep telling me no K class is available but EF showed K2, then K3 and K2. I was on phone with UA agent and ran EF simultaneously yet the results were different.