Problem with taxi and completed quest

[Ruinit 11]

I have a problem with this type of quest. http://www.wowhead.com/quest=26805/to-the-cape You accept the quest and ask flight master to send you to a spot to turn in a quest. My problem is I fly to the spot but instead on turning in the quest he tries to run back to the previous flightmaster and do it again?

How do you request from a flight master to be flown to a spot and tell the bot once you are at that spot turn in quest or pulse what you are supposed to do for the quest? 

I used return Quest.GetLogQuestIsComplete(26805); but it doesn't recognize that the quest is completed and ready to turn in for some reason It just keeps trying to run back and interact with npc

[Droidz 2738]

Hello, in iscompletequest check player position with code like

 return (wManager.Wow.ObjectManager.ObjectManager.Me.Position.DistanceTo2D(new robotManager.Helpful.Vector3(1, 2, 3)) < 50);

(replace 1, 2, 3 by the turnin position)