A process for storing and accessing data in databases of a computerized travel reservation system includes, for each type of information to be stored, created rules associating a set of criteria defining the trips to which the information applies, and a content representing the value of the information to be applied, the set of criteria of a rule including a pair of markets with a market of origin that is defined by the geographical zone of departure on the trip and a destination market which is defined by the geographical zone of arrival of the trip. A database stores the defined markets and a database stores the created rules.