So many players request help via the forum; but there's a time delay, and players don't always receive help.
I'm not sure if this is even possible; but I wonder if one day there will be a player help alert feature where players can ask for help via their quest page; and all other players who've opted to receive the alert, are notified, and have the option to port to aid the other player.
The best place this can happen is via the quest screen where buttons can be added for players to request help or opt to render aid to other players.
For simplicity, if you've already completed a quest, you can still access an opt to render aid button in any dungeon you've already completed.