For standard rates, cancellation policies vary by hotel, as well as room type. You can find your cancellation policy on your confirmation email or My Account page, and they are also available for viewing before you book.
If you are worried about emergencies that will require you to change your plans, you may want to consider purchasing Trip Protection - a low-cost insurance program that provides trip cancellation/interruption coverage. Trip Protection covers unexpected events such as medical emergencies, strikes, natural disasters and bad weather. Trip Protection does not offer coverage for change of plans due to non-emergency situations. You can purchase Trip Protection up until your check-in date. Learn more about Allianz Global Assistance and Trip Protection.