It’s important to know the policies of the travel companies with whom you are affiliated. Marriott has a very generous one for its elites when it can’t honor a reservation, as outlined here: https://www.marriott.com/loyalty/member-benefits/guarantee.mi
But wait, you protest, you’re not an elite because you don’t stay at Marriott that much. No problem. Neither do I. I have an Amex card, which in my case does have an annual fee (which I expect to downgrade soon, since I am not finding it very valuable myself, for my needs, as I am not as much of a Marriott person), that comes with Silver Elite, just as the Chase Marriott basic card does, but Marriott also offers a no annual fee credit card, which also comes with Silver Elite status. It has less perks and bonus opportunities, but unless you already are exceeding the Chase 5/24 Rule, it’s a terrific way to ensure that you will never be without a reservation at a Marriott property if you book one. That sounds like a no brainer, but go back and read “a tale of two hotel chains” to see how easy it is to find yourself accidentally without room at the inn.
The Doctor is Out (Traveling the World) 