Purchasing trip as gift with Wix Booking

I am using Wix booking for a fish chartering webpage. They’re wanting a way for people to purchase a trip as a gift without reserving a date, and get like a code or something they can give to someone to use to pick their date. I don’t know if I’ve explained that well, but so far I haven’t seen a way to do this via Wix booking so I don’t know if there’s any tricks or if it’s even possible. If further explanation is needed I can try to clear things up. Any help would be appreciated, thank you.