Here is an "Accept All" macro for you.
/click LFDRoleCheckPopupAcceptButton
/click LFGDungeonReadyDialogEnterDungeonButton
/run LFGTeleport(IsInLFGDungeon())
/run AcceptTrade();
/script RetrieveCorpse();
/script RepopMe();
This will accept your dungeon role, enter the dungeon, leave the dungeon, accept trade, and resurrect. Its a slightly modified version of the one found here in other threads, except for spelling changes blizzard made (ie LFD/LFG). I also removed the PvP ones since the commands no longer valid.