"We could not find anything about the one who contacted you, except he calls himself B."
Manager B is an 'outsider' of the company that contacted X through its system, days later that it started to work. Angela warns that B is actually trying to damage the company and that X must not listen or believe him. B contacts X different days and the conversations with him gradually become shorter because due to the high network surveillance.

Story Mode Spoilers!
B actually worked for the company and also in the creation of Angela. He reveals to X information about the capability of the AI Angela, and other documents of the company itself, but at some point of the current story, X's memory is wipe out by Angela.