How will the head of the US Mission prompt if he doesn't land in time?

SMS or email reminder, in-app notification, etc.

SMS or email reminder: Meituan may send SMS or email to remind users that they have not logged in for a long time, and give corresponding tips or encouragement, such as offering some preferential or promotional activities.

In-app notification: If the user has downloaded and installed Meituan app, Meituan can send a message to the user through the notification function in the app to remind the user that he has not logged in for a long time and encourage the user to log in again or use Meituan's service.