When there are two visitors at work to see the Managing Director and no-one (including the Managing Director) is around so you have to greet them. You ask their names, which they provide, and one second later you realise that you haven't taken this in and couldn't say what their names are if someone offered you a million pounds.
You weigh up your options... getting someone to deal with them is going to require knowing who in the world they are. You have no idea who in the world they are. It's 5 hours till going home time and someone needs to deal with them before then.
You decide to come clean, and you tell the visitors that you're going to get a notebook. You come back with it and apologise and ask for their names again. In a kindly way, they tell you slowly and carefully. You write it down. You decide not to consider what they must think of you.
You then ask if they'd like tea or coffee, and one of them would like tea with milk and no sugar. You write this down in your notebook (ha! not risking that again!) You then enquire if the other would like tea, coffee, milk, sugar... they glance at your notes and say kindly that they'll have exactly what the first one is having.