Dear Uncle,
How is everything with you?I kown you are going th have a dinner with an American host.I have some advice for you.
It's impolite to burp to show you like the food in American.Don't blow your nose while people are eating.You should leave the table or turn away if you really need to do that.Don't eat too quickly or too slowly.Don't drink too much.If you have a cell phone,turn it off.Don't answer the phone while you are at table.If you must answer an important call,leave the table and speak in another room.
Have a good dinner!
Yours
Xiaoming