To review your organization's bookings, you'll need to sign into your OnceThere account. To do so, please navigate to admin.oncethere.com and login.
After you've logged in, you will see is your "Orders" page. All of your bookings, past and upcoming are listed here.
You can either scroll through the list to find a booking, or you can enter the booking ID in the top right hand corner to search.
If it was a booking you've recently made, chances are it will be close to the top of the list.
Click on the blue ID number for more information about the booking, like Order Details, Customer Information, and Booking Details.