Hi. You mentioned in the GH desciption that you'd like some help with a name and logo.
Logo-wise, how about something that resembles a door-chain? The concept is that while it allows you to talk to the person on the other side, it restricts their complete access to your property.
With this in mind, you could call the plugin something like Book-chain (or something better ;) ).
Either way, I'd be happy to help with the design.