Hi @renatoR I haven't been able to track down a Retool meeting room booking app template 
But I did find a few community posts that might be of interest!
https://community.retool.com/t/using-retool-to-build-a-job-scheduler/12651/4
https://community.retool.com/t/calendar-with-timeline-view-for-manage-slot-booking-system/1978
https://community.retool.com/t/component-for-visualizing-schedules-bookings/20447