A: Hello
    B: Hello
    A: How do I do X?
    B: <instructions>
    B: Does that answer your question?
    A: Yes
    A: Bye
    B: Bye


    A: Acquire attention lock
    B: Attention lock acquired
    A: Information request
    B: Information request reply
    B: Reply satisfaction request
    A: Reply satisfaction response
    A: Release attention lock
    B: Attention lock released