Possible to buy 2x 50% discount Pass as a present?

Hi!

I want to give my stepson 2 Interrail passes for his graduation. With the 50% discount it is possible to give him this ánd a second ticket to take a friend with him. However, when buying the 2 passes, I have to fill in the name and date of birth of both travellers. And that is the point, i don't know whom he wants to travel with. That is up to him. Is it now impossible for me to buy the tickets, as i can't change any of the personal information after purchase?

Kind regards!