根据中文提示，将对话中缺少的内容写在线上。这些句子必须符合英语表达习惯。打句号的地方，用陈述句;打问号的地方，用疑问句。

　　提示：Sally每天下班时邮局关门了，本周六她又要与几位朋友去郊游。她想请Peter为她买几张邮票，她把钱和写好的便条放在书桌上，可以Peter没注意。最后Peter明白了是怎么回事，答应给她买邮票。

　　Sally： Did you find ?

　　Peter： Yes， But whats it for?

　　Sally： ?

　　Peter： I didnt see any note.

　　Sally： Well， I left a note saying I wanted you to get some stamps at the post office.

　　Peter： Why can't you get them?

　　Sally： when I get off work.

　　Peter： You could .

　　Sally： I know but I won't be in town on Saturday. I'm going .

　　Peter： Okay. I‘ll get them for you. What do you need?

　　Sally： I need a book of regular stamps and two of airmail. And thanks for doing it for me.

　　Peter： It's okay. You're welcome.