Unfortunately, not all accommodations offer automatic availability updates. For those, we assume they have free beds between their opening and closing dates, so that they can still appear in your generated trek plans. However, you will need to contact these accommodations directly (using their preferred communication method) to confirm availability. If a place is fully booked, you can easily re-plan your trek by excluding that accommodation (in the planning settings), and Easy Trek will suggest the best alternative routes without it.