Online booking is to go to Peking University People's Hospital to apply for a reservation card. You can't call alone, you can only limit your Beijing account. If it is a foreign household registration, a temporary residence permit is required. In fact, if you are new to Beijing from other places, you can queue up around three in the morning. If you are worried about staying in Beijing for too long and not being able to queue up at the hospital early, you can try your luck in the doctor's clinic on the day of his visit and tell him about your situation. Actually, it is not easy to see a doctor. Relax. It's not that hard. Good luck! Wish you good health.