Please accept our apologies for this
misunderstanding.
We apologise for our mistake and we would
like to take this opportunity to assure you that it
will not happen again.
We hope that this misunderstanding has
not caused you too much inconvenience.
I am writing to apologise for...
Please accept my apologies for any inconvenience.
I regret to tell you that ...
I am sorry to have to inform you that ...
I am sorry to advise you that ...
We regret that ...
I thought you might be interested to hear that ...
I am afraid I have some bad news.
We are unable to ...
We are not able to ...
We have been forced to ...
We must apologise for ...
At the end of the letter:
Please accept our apologies again.
With apologies once again,
Sorry for…
Sorry about…
I am afraid…
Sorry, but…
We’re very sorry that…
We’re sorry to tell you that…
I am afraid we have a small problem.
We are extremely sorry for/that ...
We hope that this has not caused you any
inconvenience.
Giving reasons (formal style):
This is owing to ...
due to ...
as a result of ...
because of ...
Expressing urgency
As this matter is now urgent, we would
appreciate a prompt reply.
We look forward to hearing from you at your
earliest convenience.
Due to the urgency of the situation, I would
appreciate receiving your advice as soon as
possible.
I would be grateful if you could respond as soon as possible.
without delay
immediately
