The customer said he would go back from Hong Kong at the weekend. How to reply?

Respond to the customer first, and then put forward your own intentions.

Reply to the customer first, let the customer know that the itinerary is understood, arrange the next itinerary for him, and then put forward your own intentions, so that the customer can pay attention to cooperation and not forget. For example, I see. I'll arrange a car to take you to the airport this weekend. I hope you can consider our cooperation when you come back. Have a nice trip.