How to have private chat with a offline user?

1. Enter any chat room.
2. Go to menu and select private chat.
3. Then select "insert user name" option.
4. Enter the user name, you wanna chat with.
5. Now start chatting with him.
6. If the user is logged in mig33 you'll able to chat with him.
7. If the user is not logged in, error will be shown.

DEMO

Chat room>>menu>>private chat>>insert user name>>enter the user name manually.

NOTE: You may also go to profile of the user and select chat option to have a private chat. But you may not find 'chat' option in the profile of all user.