Before you can show a data view on a new_edit page you need to set the context entity so that the data view know what to show. In this case you need to create an object “booking” and then let the user enter it’s attributes.
In the navigation you can set the on click setting of that navigation button to “Create Object”. Select your booking entity and then set the on click page to the “booking_new” page.
Now you can create a booking when clicking on the navigation item.
Hope this helped!