A:I regret that I was not able to meet your expectations.
Could you possibly allow me to have another chance?
B:Sure. How can you improve this time?
A:Let me try it again in a different way.
I'll reconsider the recovery plan and get back to you shortly.
B:I understand. I look forward to hearing your immediate update.
A:Certainly. I'll take immediate action to recover the project.


I regret that I cannot accept your invitation, and wish you the best on your company’s 10th anniversary.
I deeply regret that I made such a big mistake.
I very much regret any inconvenience caused by the delay.
I would like to express my deep regrets for sending the wrong product.
I’d like to express my sincere regret for not keeping you updated on the progress of this project.