(I work in a ground level office, and am usually the only one working within view of both the front and back doors.)
Customer: *coming in from the back hallway* “Hello, I’m here for my appointment.”
Me: “With who?”
Customer: “With [Name].”
Me: “I think you’re in the wrong office.”
Customer: “Oh, terribly sorry.” *goes back down to the backdoor, and reappears from the front door a few minutes later* “Hello, I’m here to see [Name] for my appointment?”
Me: “Ma’am, this is the same office. You have to go down the stairs in the parking lot to get to [Company Name]. They’re on the basement level.”
Customer: “Oh! That explains it, thank you!” *heads out the front door again, but wanders back down the back hallway almost immediately*
Me: “Still in the wrong place, ma’am. You need to go downstairs.”
Customer: *scowling and glaring* “You’re much less polite than the other two boys!”