rare !!

Jane:Hey! Where have you been?
John:I went to the post office.
I had something to send to my grandmother.
Jane:Ah! My friends found you.
Did you go to the post office in front of school?
John: Yes. Why?
Jane: my mom had worked at the post office before 2000.
John: oh! I had worked at the post office until last year .
Jane: oh!she had already left before you work there.
(Narration)
John and Jane are friends.
They find an amazing fact in their conversation.
John and her mother worked in the same post office.
It’s very rare.