Guest 1, Guest 2....

We want to client to be forced to enter names on the guests. And also emails. Names are required in case our Port Captain asks for records of who was on our boat. We need all the names. Emails we want for marketing purposes. Rigth now we reserve a boat for 6 divers, we only get one email from the person who made the reservation. Ultimately we want the email from all 6 divers so we can market to them in the future.