How to implement a Welcome message

Hi all,
I have added to a unity scene the Chat UIs that coem with the demo, and it is working fine.
I would like to know however, what would be the best approach to have the chat write a welcome message once a client has connected to the chat server, possibly coming from the server.
I am exploring a way to have the client do it on connect, but it would probably be prefarable let the server do it.
Many thanks