@Anh-Nhi0 Yes, he can write you 2 reviews, First one you or he can adjust to being shorter. Then another one you can send a special offer or let him booking. so total is 2 reservation.
But beware that if you message him to offer something exchange to a good review you are wrong to Airbnb policy but if it just "thanks for a refund I will write a good review" this is okay. As a host, we know that we need review but try not to exchange or give someone a money for a good review.