When the booked guest does not show up for a reservation, the host is not required to do anything.
It will be treated as a cancellation by a guest past the cancellation deadline, and 100% of the price will be charged to the guest.
Therefore, no refund will be given to the guest, and the host will get paid for the sales in full for the no-show.
The same applies when a guest cancels by himself/herself anytime after the deadline to confirm the event.
Related Article: For Hosts: Cancellation Policy