thats not my name

yesterday i was walking in school and suddenly i saw a girl in a crescent uniform who looked terribly familiar.
She looked at me and said, "Miriam?" and i replied "Oh yes, hi, um...Su...um...."
I forgot her name!
she had been a classmate of miine in primary school and i could not remember her name.
at all
this is terrible, i felt so bad. she remebered me but i didn;t remember her.