One of the things with working for an international organization is that folks you work with know your name, but not your face. So when you are actually in a face to face meeting as one of the participants, you don't recognize them and by the time you do, they don't always recognize you and you have to remind them.
These reminders are not always easy especially when the folks are senior, but I feel that in general this is a great lesson in humility and patience. I always mention my name and how we interacted and that usually helps. ( until the next time we meet in a few cases)