Please find [file] attached.

Please accept our apologies for any inconvenience caused.

Could you give us some more details on your inquiry?

We regret to inform you that the payment cannot be refunded.

Please keep me informed

Please let me know if this is OK with you.

I'm enclosing the approval letter.

Thanks for your feedback on/your invitation/your suggestion

Sorry it took me so long to get back to you.

He approved of it, so you can go ahead with the project.

Just a quick heads up -

Please find my two main questions below.

He approved of it, so you can go ahead with the project.

Can you make it on Tuesday? If so, I'll book accordingly.

It's against company policy to approve your requests.

Please let me know if this sounds good

We are sorry to inform you that the interview is rescheduled.

After careful consideration we have decided not to process your application

You (totally) have the green light!

I am available on Friday, if that's convenient for you.

We regret to inform you that your request has been declined by the system.