That just means they need proof of your visit. You may want to verify with the scheduler, but a business card has always worked for me and in the case they don't have one (highly unlikely) the salesperson can write his name and phone number on a brochure.
Equal rights for others does not mean fewer rights for you. It's not pie.
"I prefer someone who burns the flag and then wraps themselves up in the Constitution over someone who burns the Constitution and then wraps themselves up in the flag." -Molly Ivins
Never try to teach a pig to sing. It's a waste of your time and it really annoys the pig.