Call HR during the interview, don't answer, don't return messages.

1, HR has no decision. HR and the department manager are optimistic about you, but the CEO needs to check it personally, so HR and the department boss have no choice but to follow the CEO's advice. I may feel embarrassed, too, so I didn't answer your phone. This is not uncommon in the workplace. The boss may have changed again, so the time can't be fixed, or the company has temporarily stopped hiring, or there are other suitable personnel, so there is no contact in the future.

2. It is also possible to be interviewed while eating. You don't meet the requirements, or they know through background investigation that you are not suitable for them, so there is no following.

The above two situations are speculations, which does not mean that it must be one of them. If you are optimistic about this job, don't think too much, you can wait quietly or take the initiative to go further; If you value the details of a company, after all, the interview is also a two-way interview with your company, so don't go, just find another company that suits you.

Good luck with everything.