Setup 3
WIRED Trigger: User Walks on Furni (Select the door)
WIRED Selector: Furni Picks (Select the "first" seat)
WIRED Effect: Send Signal (Select an antenna)
WIRED Trigger: Receive Signal (Select the antenna)
WIRED Negative Condition: Furnis have NO avatars ("Use furni from Signal")
WIRED Selector: Furni In Neighborhood (check "filter existing selection" and "invert", select the tile of the next seat, "Use furni from Signal")
WIRED Effect: Teleport to Furni ("Use furni from Signal", "Use the triggering user")
WIRED Negative Effect: Send Signal (Select the antenna)
What does this setup do?
It sends signal for the first seat, then the condition checks if there's a user on it. If the first seat is empty, it teleports you to the seat. But if it's not empty, negative effect executes and it sends signal for the next seat. If it's not empty too, it keeps checking if the next seat is empty. The loop continues until it finds an empty seat.