Biggdr

So i want the ability to do /battle <rank> but i want the rank to = permission the whole base idea is to send a battle request to a player with a specific permission (yes everyone with that permission would get that same battle request) and for the person who WAS requested to have the ability to accept or deny the battle request. If they player that got requested accepts it, both the players (one that got requested and requester) with get teleported somewhere. Any idea how i can go about this? Example: player1: /battle water player2: "you have received a battle request, do you want to accept?" player2: *accepts* both players: get teleported to arena