Dear, Guangzhou is now a high-risk area. Anyone who has had an activity track in Guangzhou within 14 days can&;t fly (please contact Baiyun Airport staff for confirmation).
Even if you can leave for Lhasa, which belongs to a high-altitude area, its own medical conditions are not as good as those in the mainland. For safety, tourists from high-risk areas have to do nucleic acid isolation in Lhasa, and they have to do it at their own expense.
It is suggested that airlines that have already purchased tickets negotiate a refund or a change, or wait for a while before going out to play. Their own safety should also be put first.