YSK that when asked for your address, name, phone number or other personal information by a cashier, "No thank you" is a perfectly acceptable answer. Protect your privacy.
from /r/YouShouldKnow
YSK表示，當收銀員詢問您的地址、姓名、電話號碼或其他個人信息時，"不用謝 "是一個完全可以接受的答案。保護您的隱私。