Abstract
This paper describes a Interactive Itinerary Planning web system that supports travellers in the selection and comparison and bundling of travel products. In addition to traditional information search and filtering, the system supports interactive query management to help its users to plan a leisure trip. Case Base Reasoning and similarity base retrieval techniques are used for selecting and ranking suggested travel services (e.g., accommodations or sport activities) as well as innovative advanced techniques to help the user to refine the query in the case it fails to satisfy the user’s information needs.