Well, I finally have my proof. This guy is a complete scammer. His story is: "I'm being charged an additional fee by (X) airline because the reservation was made in England." He claims that he's trying to catch a flight home and that he might not make it if he doesn't come up with some money. TWO of my co-workers have been scammed by him as of today.
He has a British accent and will even provide you with a fake address in England "in case you want to contact him". He gives out the same e-mail address, though: firstname.lastname@example.org.
DO NOT GIVE MONEY TO THIS MAN!! HE HAS BEEN DOING THIS FOR AT LEAST A FEW YEARS!!!!!