No matter what they say, be patient.
Listen and waiting for their question.
It's the point.
When it's your show time,
be cool and deny everything they just friendly said firmly.
"No, I didn't buy anything."
"You didn't? You didn't buy a pair of gold flip-flaps on 13 June?"
"............" "Sorry to bother you. Bye-bye."
See, they can be polite sometimes.