Duke of Clan A says in the game CHAT: "Gandalf, I want an alliance with clan B"
Duke of Clan B says in the game CHAT: "Gandalf, I want an alliance with clan A"
and you write a PM after this.
i will check the server for this:
- who said this?
- is he duke?
if both is fine, i do the alliance

only one duke is enough, to undo the alliance btw. again...
Duke of Clan A OR B says in the game CHAT: "Gandalf, I want to stop alliance with clan (B OR A)."
i check on server and if that was said, i remove the clan alliance.