When you can’t remember someone’s name, try to remember where you know them from. You can say, “It’s been too long. When was the last time we saw each other?” If you can remember the context, it might help you remember the name.
Tell the other person, “I’m so glad to see you here. I’ve been meaning to update my contact information. Would you mind typing yours in for me?” Then hand them your cellphone.
If everything else fails, be honest and admit you have forgotten the person’s name. Try something like, “I’m sorry. Your name has slipped my mind.” Or you could say, “I’m really good at remembering faces, but bad at names. Please forgive me for asking yours again.” The other person might suffer from the same problem. And he or she could be relieved to know you’ve also forgotten.
When you finally hear the person’s name, work hard to memorize it. Remembering someone’s name lets them know they’ve made an impression on you.
slip one’s mind：忘記、想不起來、忘掉
…have been meaning to…（一直打算去做…）
out of context：被斷章取義