Abstract: A system for booking travel services establishes booking costs based upon a percentage of users in a customer organization that employ self-service booking tools. By bundling call center services from different service providers, an intermediary can offer an aggregate price to a corporate customer that is explicitly tied to the percentage of self-service booking by corporate members. This system advantageously permits a buyer of travel services to quantify the savings from using low-cost, self-service tools, while ensuring that self-service and full service tickets are obtained at a competitive cost.