I received reply from Patrick-san about the hotel.
His reply is as follows:
>Preferable I like to stay continuously at Marriott Pattaya. In other words after meeting always come back to Pattaya..
If Bangkok is needed to stay, than I prefer Sheraton at the river.
So, would you book Marriott Pattaya, C/I 12 Oct., C/O 16 Oct.?
At the same time, would you re-arrange a car for him?