There is countless number of such situations. For example, airline tickets. You cannot just enter "Jack Daniels" into the GDS, both first name and last name are

There is countless number of such situations. For example, airline tickets. You cannot just enter "Jack Daniels" into the GDS, both first name and last name are obligatory, and they are separated by slash. That's just the format these systems use for the last 50 years, you cannot do anything about it, you can only pass the problem onto the end user. Then, as you are surely aware, he will have to prove that's really him in the airport, using a document of some sort.