Just pay

Cust puts a dress on the till...

AH: have you shopped with us before?
Cust: no
AH: if I can just take a few details to set you up on the system, it just means that if you want to return it then everything is there already for you
Cust: (sarcastically) can't I just pay for it?
AH: yes, of course
Cust: (with more sarcasm) thank you...