Another two halves of a conversation here.
“Did you serve my friend earlier?”
“I can’t remember what my friend ordered earlier. Do you?”
“I don’t remember what your friend looked like. Were you standing next to her?”
“No, I was at the table. She just came up to order.”
“Well then how could I know what she looked like?”
“Oh I don’t know? Maybe I should ask her?”
“Yes, maybe you should.”