今天早上打电话到CBP咨询过境的一些问题， 被索要个人信息， 问题大吗？

情况是这样， 本人和老公都是加国护照， 两个小孩持有美国护照和加国枫叶卡。
今天早上我打电话到peace bridge 的CBP询问过境消息， 对方问我last name,first name, date of birth,
我讲了我的出生月份后， 就问："do I  have to tell you this? I just inquiring information。“
对方回答：“if you don't tell me , I cannot help you.
我说: " I am still in Toronto, and I am not crossing board. I don't feel comfortable to give me personal
information through telephone."
对方说：” you even don't want to tell me your birthday, I can't help you. Have a nice day!"

不明白US CBP 目的何在？

所有跟帖： 

• 再问：请问咨询CBP,必须要给出个人信息吗？谢谢！ -绿色风铃草- ♀ (0 bytes) () 04/24/2013 postreply 05:52:42

• 回复：再问：请问咨询CBP,必须要给出个人信息吗？谢谢！ -863211- ♂ (55 bytes) () 04/24/2013 postreply 05:58:48

• thanks. -绿色风铃草- ♀ (6 bytes) () 04/24/2013 postreply 06:13:57