Ok, turnin quest manually, add quest type "InteractWithNpc", in "Macro when interact..." add lua code like:
RunMacroText("/click GossipTitleButton1");
CompleteQuest();
RunMacroText("/click QuestFrameCloseButton");
RunMacroText("/click QuestFrameGreetingGoodbyeButton");
(replace GossipTitleButton1 by npc button name, to get button name use this script: http://wrobot.eu/forums/topic/1689-useful-scripts/?do=findComment&comment=8447 )