The hotel receptionist forgot to call in advance. Do I need to pay for the guest's air ticket?

The receptionist doesn't have to pay for the plane ticket. The hotel is mainly responsible for the safety of guests. As for calling early, it is only a small part of serving guests and has no legal effect. But from a reasonable point of view, the hotel should apologize to the guests and make a symbolic compensation for some expenses when necessary. As for the hotel's fine for employees, it should be implemented in accordance with the hotel's internal regulations.