Comment by nirui

The example on the page don't really do it justice, because both of them are O(4), and the time delay is arbitrary.

The "" example should only consist of 3 operations: Dawn: REQUEST, Tim: RESPOND, Dawn: CLOSE. For example: "Hiya! What time was that thing?", "hey, 3:30", "Ta - seeya then!". Or even just 2, Dawn: REQUEST, Tim: RESPOND (auto close), this could imply that Dawn and Tim are really close, or really not close.

BTW: We are not designing reliable messaging protocols here folks. The chat software should tell if any message was lost.