The ticket reservation channel may not be open due to the following reasons:
- The activity or attraction is not yet ready and may still be in the preparation stage.
- The ticketing system is being upgraded or maintained.
- Due to the epidemic or other emergencies, temporary measures have been taken to restrict the flow of people.
- Event or attraction organizers may be waiting for better times or conditions to open reservations.
- Appointment channels may only be available on specific dates or time periods.
The specific reasons need to be understood based on the actual situation.