Hello every one!
Today, I have a part time job, at that time a foreigner asked me where is the entrance in English.

I told him where there is somehow.

He said Thanks you then I tried to say You're welcome.

But I was not able to say something quickly that because  I know two ways to saying:"No problem" and "You are welcome".

In this case, what should I say "No problem" or "You are welcome"?