Let the guests sit on the sofa or conference room at the door, and it is best to ask the guest's last name before you inform the manager. If you run straight, you should play it by ear or ask him if he wants tea or something. The manager's office really can't just enter people, there are important materials and even the company's license. Most guests should be considerate, remember to be kind and smile. If you really can't stop it, it's not your responsibility. Don't blame yourself too much. As long as you do your job, I believe the manager can understand you. Good luck in your work, take your time, and your work experience will always accumulate.