I would like to cancel a book of my apartment from a customer in booking .

Because of a mistake in prise which I gave in my apartment in booking some days ago I had a book from a customer. 

There is no any option because of this reason in booking in canceling need.

How can I open cancel the reservation and open the dates for a better prise for me.

It's too cheap. I was beginner and I did this mistake.

I need to help me to fix it and be the customer again free to choose the right one for him.

Also to make sure that the customer will have a full refund. 

I'm looking forward for your answer. 

Kind regards, 

Anastasia