Háiyǒu kōnɡ fánɡjiān mɑ？

还有空房间吗？

Do you have any rooms available?

Notes:

还有(háiyǒu): still have

空(kōnɡ): empty

房间(fánɡjiān): room

吗(mɑ): question word

Example:

A：还有空房间吗？

     Háiyǒu kōnɡ fánɡjiān mɑ？

     Do you have any rooms available?

B：对不起，没有了。

     Duì bù qǐ.  Méi yǒu le.

     Sorry. We don't have any room available.