There are several softwares out there that can help. I know that FareHarbor is a great resource. They are more for the Tour guide niche but can be 100% customized.
You can also use
And Little Hotelier
These are all platforms I have never used or seen used on a Duda site. Just a quick Google Search to point you in the right direction.
Duda has actually launched a native app called Bookingmood that you can utilize.
Try a free trial of the app here - https://apps.duda.co/apps/bookingmood
Bookingmood is amazing @Girubuntu ! You should give it a try. We vetted quite a few of these solutions and really loved what Bookingmood was doing from a UX standpoint.