When a meeting room booking ends, send the member a short chat message asking how the meeting went and whether anything in the room needs attention. Ask only once per booking, and don't message the same member more than once a week.
When a member replies to that message in the chat, thank them. If they report a problem, such as broken equipment, cleanliness, or noise, open a support ticket for that location with their feedback, the room name, and the booking time.