The domain name reservation request is a service that allows anyone to reserve a domain name in case the name is not yet available to the public.
If you wish to use a domain name that is currently owned by a third party, you can submit a domain name reservation request to the registrar. The registrar will notify you when that domain name expires and becomes available to the public again.
This could also work for your domain name if someone else has an interest in it.
If you are looking for a domain name backorder service, you should look for one that works with multiple registrars. The more registrars, the more likely you are to succeed.