There are two ways to take your name off the guest list.
Go to civicdinners.com, make sure you're logged in, go to the "My Dinners" page, find the dinner you rsvp'd to attend, click on that and scroll down until you get to the black ribbon. Then you'll see "I can no longer make it" as shown below. Click that and you're all set.
You can also go to your confirmation email that was sent to you from "firstname.lastname@example.org" after you rsvp'd to the dinner. Below the "dinner details" section of the email, there is text that says "if you can no longer attend, click here". This will then take you to the dinner page and you simply click the link shown above.
Then we hope you'll find another dinner to attend!