Guest checked out without paying

Hello,

We are writing to you from the hotel 15th Avenue in Vilnius, Lithuania.

We have a situation where the guest left our hotel without paying. He paid for the stay via booking.com, but he did not pay for the city tax, water, etc. We've been provided only the booking.com credit card and we cannot charge extra. What we should do next? Guest's reservation number: ***.

We look forward to your response.