Click on the search bookings button, and below will be what the search booking page will look like. The most common search is by start and ending date. The second most common to add to the by-date feature is if you are only looking for quotes or only for ticketed or unticketed reservations.

Once you have searched and then clicked on your booking, below is what the reservation/quote details will look like. In the upper right, is where you would click to cancel