use (!N) as long as it's being sent as a message
EDIT: use this line:
Message = Messenger.MyName + " " + first + " " + "(!N)" + " with " + second + " " + third + "!"
If it was not being sent as a string or message, you would have to iterate the contacts and use Contact.Name. Luckily there is a feature in plus which can send the other contacts name for you