Is he really interested in answering messages for an hour?

Hello, dear, this may not be true. This may be a system robot. If many people greet you as soon as you come in, and the greeting language is fixed, this is probably a robot. It is easy to distinguish between real people and robots. Be careful. You can try some different questions to see if the opposite reply is fixed and whether there is a targeted reply. If the reply language is universal, it may be a robot.