Chinese to English Translation

hi, thanks for your invitation! if u say (見字請覆), that means the guy already read ur note, so u only need to say ........
Please reply as soon as possible. that is enough.

Please let me have your reply as soon as this note is read.
Sentence seemed very bulky but this is exactly meaning 見字請覆 in English

"(Please) reply upon receipt (of this note/message/mail/etc.)"
"Promptly respond upon receipt (of this note/msg/mail/etc.)"
I found some additional reference:
http://forum.wordreference.com/showthread.php?t=393425
Hope that helps.

CALL ME WHEN YOU SEE THE NOTE.