If booking a multi city itinerary on United Mileage Plus, it prices each segment differently. For example for Ethiopia Air,segment 1 (ADD - LLI) is priced 8,800, segment 2 (LLI - GDQ) is priced 17,500, segment 3 (GDQ - ADD) is priced 8,800. With the 24 hour free cancellation is it allowed to book this multi city itinerary and then cancel only segment 2, the most expensive one, since the cash price is much cheaper for LLI - GDQ? If I try just the segment 1 and segment 3 the entire pricing structure changes, and not to my benefit. Thanks very much.