who are you?

What would you say when you meet someone who you didn’t see him or her for a long time? “Long time no sees” or “how have you been? And what would you say when someone comes to you and says “long time no sees” but you do not recognize him or her? “Who are you?” A thought flashed through my mind. It happened few days ago. Someone who I couldn’t recognize him well came face to face with me, and said: “Wow, long time no sees. How are you?” “Ha ha, I’m fine…”I replied embarrassed. That day we had a short talk about our recent situation, but I didn’t remember him until now.