@Kelly21 No, your normal cancellation policy applies and you're not obliged to extend any additional refund. If you want to encourage them to push their cancellation through the system, you could offer a token refund of any dates you're able to successfully re-book, but with only 2 days to go, this would come off as an empty promise.
Caveat: if the guests are choosing to leave early due to an unresolved Travel Issue that they've reported to you (missing amenities, unclean home, etc), in that case they would be entitled to a refund for the remaining nights. But if it's just that their plans changed, they could have bought a travel insurance benefit to cover that - no need for you as the host to take an income loss over it.