Boat trip booking form

Hi, thanks a lot for Jotform, I'm really satisfied with the service. 

I want to create a form to book boat tours, but there are several "problems".

The first problem is that the boat can transport up to 16 persons, no more than this can be sold. So, when a ticket is sold the total amount of available tickets for this date and hour must decrease.

Also, there are some special conditions that would make the price increase (incluiding menu) or decrease (children's price).

Can this booking platform be made with jotform or should you recommend to use something as Eventbrite?

You may try using the inventory widget or the quantity gift registry widget in which you may limit the number of tickets.

https://www.jotform.com/widgets/inventory

https://www.jotform.com/widgets/quantity-gift-registry

Also, there are some special conditions that would make the price increase (incluiding menu) or decrease (children's price).

You may assign values to your fields and use the form calculation widget.

Guide:https://www.jotform.com/help/301-How-to-Assign-Calculation-Value

https://www.jotform.com/help/259-How-to-Perform-Form-Calculation-Using-a-Widget

Can you please share an example so that we can try to create a sample form?