Table customs are different around the world. If you are in Thailand, this information will help you.
In Thailand, people do not eat with chopsticks, like in China, Japan, and Korea. They use spoon and forks. They never use and you finally say yes and take a little. If you really don't want any more, take very little and leave it on your plate. It is the same with whatever you are drinking. During the meal, never empty your cup or glass. When it is less than half full, your host or neighbor will refill it. Never fill your own glass. This means that the host always keep an eye on the guest's glass all through the meal.
The most important place at a table is at the middle. An important guest will sit at the middle of the table on the side, and the host will sit at the middle on the other side. This may be confusing when the table is round, but the Thai get it right somehow.