Dear Mrs. Supaporn Muenkan, You just received a booking modification from a Booking.com guest. 
Review the booking modification details here. 
https://admin.booking.com/hotel/hoteladmin/bookings/booking.html?bn=757511969&hotel_id=1092640&lang=en&message_num=2
Reservation without credit card details
A guest booked a stay with you without the need to fill in credit card details, so payment will be arranged upon arrival.
Kind regards,
The Booking.com Team