Well, in real life it doesn't happen like that. An aircraft approaching an airfield will be given instructions regarding runway in use, etc. When the pilot reports on final approach he will be given a landing clearance. If the runway is obstructed, or for other reasons preventinga landing, the pilot will be instructed to go-around for a further approach.
Maybe you are thinking of an airfield where prior permission must be obtained before arrival. This maybe issued by the airfield operator or by ATC. This will have been sorted before the aircraft makes an approach and then whether it lands will be up to the controller based on other traffic.
HTH