Call the store and tell them the problem.
It's possible that whoever made the reservation gave the wrong info, or the person at the store entered it incorrectly. The result is that whoever is expecting to come in on Wednesday at 6 pm is in for a surprise on Wed, or didn't get the notice at all. For example, if your email address or AppleID is one character different from someone else, I can easily see how a mistake would be made.
If the person who made the reservation also left a phone number or other contact info with the store, perhaps the store can contact them and make a correction.
Think of it as someone (the store) dialing a wrong phone number, asking to speak to Albert (assuming your name isn't Albert). I usually tell the caller there's no one here by that name, and then ask them what number they're dialing. If they tell me my number, I tell them the number they have is incorrect. But if they misdialed, I tell them that.
I also googled
iLog genius bar appointment and found this:
https://discussions.apple.com/message/23758501
So maybe it's a glitch in the Apple system, or maybe it's something worse. I'd still call the store and see if they have any additional info on who they expect to be seeing at 6 pm on Wed.
