What do you need with their EIN? I can't think of a legitimate need from a person asking in this forum.
2ndly, the Houston TX area probably has a dozen pizza hut franchises all with different EINs. Even if you have a legitimate use, the odds are you will get the wrong number and cause someone problems.
If you have a legitimate use then call the Pizza Hut in question, make sure you have the one you need and ask them over the telephone.