[23:20:10] X: Do you know you can leave a conversation? Go to -> Conversation (in the menu)--> Leave Conversation...
[23:20:17] *** X has left ***
[23:20:54] *** Y added X***
[23:20:56] Y: do you know we can add you back?
[23:21:16] Z: lol
[23:22:25] X: Do you know I can close my Skype?
[23:22:50] Y: lol
p.s. you can also write /leave in the conversation - which will cause you to leave too.