What does he mean...his own security?
You might want your whole fee up front...for your own security, it works both ways.
My friend had client get a letter wrong in her name on her plane tickets, she was fined $50 to correct it, like you mention. The outbound airline accepted it but the returning airline didn't. I don't know what happens for entire fake or partial name.
Client booked my tickets and I gave him my real name, I hadn't really thought of privacy issue then. He also paid in full cash before I went over. 'For my own security'.