Sighting

30 minutes before the National Gallery closing. A guy called David (caucasian, 6ft ish, brown hair, british, no glasses) started a conversation with me.
You told me you worked in conservation, I asked you what that is.
I told you I just moved here. I got nervous, shook your hand and walked away.
Realised my mistake later and tried to look for you again. You were gone already.
If you see this, please reach out.