Ms Teams connector right now has only 4 trigger. You can list team IDs channels and post a message to a channel.
But this connector needs more !!
For example you should be able to send messages to a specific person via your Flow from MS Teams.
Also there can be some triggers as well. When a message is post to a channel or When a channel is created or many thing can be done. I think if MS Teams connector is improved, it can be the best app which alets teams and departments instantly with Flow..