The booking agency uses an electronic reservation system to secure reservations for accommodation and sundry tourist facilities (e.g. adventure offers). With such action, the booking agency does not perform its own services; the services it provides are in the name and for the account of third-party undertakings, hereinafter designated the "accommodation provider" if overnight accommodation is provided or "service provider" if sundry tourist services are provided. The contract in respect of the service booked is concluded exclusively between the guest and the provider of the accommodation or the sundry tourist service. The booking agency and the guest are bound by an intermediary agreement. The scope of services provided is indicated in the booking confirmation. Ancillary agreements altering the scope of the contracted services require written confirmation.