Personal chats are not limited to users within your course. They can be used for chats with colleagues/peers, or office hours. You can create personal chats from any course, and you can access them within any other course.
Personal chat rooms can only be accessed by users who have been added to the personal chat’s Participant List. When users are added, the chat room displays under Personal Chats in their list of chats.
Next Steps: View, Add, and Remove Members from a Personal Chat