YOU SHOULD BE FRIENDLY!

首先当然要做好功课，足够了解你的产品。 顺便客人国家的一些信息，小习惯，饮食，文化等等。。。闲聊时不会冷场~~~

In fact, It is no big deal. You should be very familiar with your products and try to introduce them to your client particularly. One more thing, try to make your boss and client agree on a good price which is beneficial to both parties. Good Luck!!!