Can I help you?或者What can I dao for you?
I want to buy ……but I don't konw where they are?Can you help me?
这是顾客与服务员之间的简短对话,这是经常发生的.如果可能的话服务员还会为你推荐一些物品,这是就是：You can try this,I think it's very appropriate for you.或者These goods are special and very good in our supermarket.……
暂时我只有这些,看看如何?不是服务员，是和外国人啊和外国人对话，那就得看情况分析啊。只有自己经历才知道说什么啊。