Aiding User Intention Satisfaction with Case-Based Reasoning in ATIS applications

We propose a method which reuse an old plan from past experiences to satisfy the newly created service request from the user. The user´s service request intention is interpreted and represented by computable goal models. A plan consists of a series of actions to achieve related goal models. The actions include internal function calls and external services invocations. A hierarchical case-based reasoning (HCBR) mechanism is used to store and reuse the past problem solving experiences. When new goal models are identified, the HCBR retrieves an old plan and adapt the plan for achieving the newly identified goal. The case base is decomposed into two levels: abstract level and concrete level. The case in the abstract level contains the descriptions of sub-problems, and the case in the concrete level contains system functions to solve the sub-problems. The proposed approach is implemented in the service requester agent of the Advanced Traveler Information Systems (ATIS) to enhance the service assessment.