Exactly, it depends on the semantics. For example, if I'm exposing a salon's schedule as a resource, perhaps when a booking is cancelled it is thrown away (or o

Exactly, it depends on the semantics. For example, if I'm exposing a salon's schedule as a resource, perhaps when a booking is cancelled it is thrown away (or otherwise made inaccessible). But in your case, you would still want make the cancelled booking available to REST clients, so PUT would be more suitable for you.