Abstract: A dialogue system comprising: a user input a processor; and a memory wherein the processor is adapted to update a dialogue state in response to a natural language input from a user, the dialogue state being stored in the memory, the dialogue state comprising data structure that the stores the information exchanged between the user and the dialogue system, the processor being configured to update said dialogue state by comparing said natural language input from the user with a plurality of possible actions, said actions indicating possible requests of the user, and update the state using information from an action that matches with the natural language input, the processor being configured to generate a response to the natural language input using the updated state.