おととい キャンセルしたい旨のメールを送ったんですけど届いてますでしょうか? キャンセルさせてください
大変丁寧な文章
This is to re-confirm my email sent the day before yesterday
in which I asked you to cancel my reservation made earlier.
Your due confirmation is still missing at this writing.
Please let me know per return if you have made cancellation
or not. If not, please make sure that my reservation is
cancelled at your end per your return mail.
普通の文章
The day before yesterday I emailed you to cancel my
reservation. Please cancel it and let me know per return.
簡明(少しぞんざいな)な文章
I asked you to cancel my reservation the day before
yesterday. No reply from you. Please cancel it and let me
know.
お礼
助かりました
補足
助かりました