as a host I wouldn't accept a last minute request 24 hours before a stay to cancel and refund a guest or let them book for a much later date, as I would then be out of pocket because of a change in your arrangements . @Souro5
This is why guests should have travel insurance
i don't understand what happened with the original booking . Did you cancel? Did you put in a request to change the dates at the time?
i don't understand your comment 'now when I book for the fall the owner cancelled the booking stating he can't provide a rebate' what booking is he cancelling?
the best way to get your money back is to claim on your travel insurance