how to implement one to one chat between database user ?

Question

I am quite new to SignalR. i have found some code that allows to chat between two live connection. but i want to implement one to one chat between registered database user. i.e User A,B,C are registered users. so they can chat one to one (A to B),(B to c) (C to A) using Asp.net mvc, signalR. any guideline or sample code are highly appreciate.