Ask guest to pay for the non-respect of house maximum person limit

Dear community,

One of my guest showed up with 10 people instead of 9 as the limit is mentioned on the house description. 

We would like to make her pay for this extra guest who will basically sleep on the couch and use towels and sheets available for the next booking.

Do you know how to do it via the Booking platform?

Thanks for your help.

Regards,