Inform the Ressource owner if the chair cancels an appointment with a ressource.
Currently it sometimes happens, that the chair cancels the appointment ,but the ressource owner is not informed and ordered a catering.
Ressources can be combined with additional requests. E.g.: A room reservation needs to know the layout of tables and chairs, if a catering is needed, additional ressources like beamer, flipboard, office supplies, ...
The chair should be enabled to fill out a request form.