I like the idea of this, though I don't know if there's a way this could be implemented... do recall several threads requesting a player mail system where you can send messages to people whether they're online or not getting a flat no from the devs as it would be problematic to implement.
There are always the forums for that kind of thing though, just send in a post for the shard marketplace of your choice and you tend to get good responses for that. Though this system isn't IN the game itself so newer players may not know of it until told to check out the forums.