Dear @Brian870
Hope you are well.
As mentioned m above it is very difficult for a host to double book unless there is a technical bug in the system in which case the host is responsible for highlighting this , or its down to a silly admin error such as someone booked via a different rental
Under no condition should you miss out on any monies because of someone else- and if you want to coordinate with the host. You could also offer to cancel as a guest as this would keep them from being penalised so long as they confirm a full refund. But if you go down this route please only do so via the Airbnb message app- as to have a full record of it. Protecting both parties from any Bad faith, etc.
Good luck to you and I wish you a fantastic stay in Jamaica!
have a beautiful day!
yadira 🙂