ฉันเสียใจจริงๆสำหรับเรื่องนี้
There are internal reasons that we may required to change the date for this conference and will ask for your support to advice rooms availability and quote for estimated 10-13 participants/rooms.
We are looking for the period of 5-10 October or 8-13 October.
5 Oct or 8 Oct : check in, room only
6-9 Oct or 9-12 Oct : room and conference
10 Oct or 13 Oct : check out