what can I do for you可用什么回答

问句应该用what can I do for you?
这个问句是服务行业里服务生招呼顾客的话,而回答应该是 yes,I...更客气点的话,当然可以回答yes,please.I...但是不能只回答一个yes,please.就没有下文了.
如果问你would you like to have soup,那么回答就应该是 yes,i'd like to have XXX soup.就是要具体点汤了,否则没必要再重复一边.
总之,
what can I do for you?
yes,please.I'd like to have soup
完全正确,没有问题的.