Prebook from serp

This method updates the availability of the requested rate. If the original rate is not available, the method will try to find the same or similar rate with a new book_hash. If exactly the same rate was not found and the request specifies a permissible price increase in price_increase_percent, the method will try to find the same room, but with an increased price. In a new rate with an increased price, the values in payment_options may change.