Please help me to correct this sentence

[Christofred]

Dear Sir,
I am working for a software deveopment company
Please advise me whether I can use the following sentence to forward this to a client.
"Please regret that I could not send you the report yesterday since I was on leave."

[Casiopea]

What about?

My apologies for not sending the report yesterday. I was on leave.

All the best.

[RonBee]

Dear Sir,
I am working for a software deveopment company
Please advise me whether I can use the following sentence to forward this to a client.
"Please regret that I could not send you the report yesterday since I was on leave."

You can't use that sentence. (The regret is yours. It doesn't belong to the other person.) Instead, use Cas's suggestion. You could also say: "I regret that I couldn't . . . ."

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~R

[Christofred]

Thank you very much for clearly pointing out the mistake and your suggestions.