Wanted: schedule or timetable

Hi there!
I wonder if there is an app to organize rooms. I need an app to book certain rooms in advance for an hour or so. It should be like a timetable, where you can see if the room is available. I don’t want to expand the calendar app with this information.
This would be really great.

Works has been started to get rooms and resources into the caldav backend. But there lacks some in it still. A feature request is open at github for the calender app.

Since the caldav backend has support for stuff like this here should be possible to build a separate app for it.