find 一定系find something/ someone
attached 系附加一D野, 最好说明附加了什麼.
例如 attached file, attached document
至於advise, 是解提议一些东西, 你想问订单是否有效不应该用advise吧?
如果是我,我会这样说: I would like to know whether the booking number 086177843 is still valid or not, please find the attached (file).