Read @Helsi 's reply in this thread:
I had a guest check in last week for 4 days. Within 30 minutes of checking in, I got a message saying that he would need to leave a day early to go home for a friend’s funeral. I have a moderate cancellation policy which allows me to keep 50% of the money for a guest who cancels after check-in. When I went to modify the reservation, the system wanted to give the guest the full price back for the unused day and I had to manually modify the price for the 50% fee. Why does AirBnB not automatica…
Seems the way to make the system do it automatically is to have the guest cancel the reservation (presumably on the last night they intend to stay).
An alternative is to have a second alteration request for the guest pay you the 50% for the unused days.
Have you messaged the guest about it?
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