Dear Sir or Madam,
I hope this message finds you well and in good spirits. I am writing this letter with the crucial purpose of apologizing about poor service from a member of my staff.
On the one hand, the first and important thing which should be mentioned is that the waiter did not provide good service. He took the food late.
On the other hand, I would greatly appreciate it if you resolved this issue as soon as possible.
Finally, having given the previous facts if you need any further information, please contact me at your earliest convenience.
Thank you in advance for considering my request. I look forward to hearing from you in the future. I remain available for any clarification you may need.
Yours faithfully,
Jennie Ball.