Dear An,
I hope this letter finds you well. I am writing this letter to express my apology for my absence on your birthday last Saturday. There are no words that are worth addressing my regret.
I did detail a specific plan on your birthday. I chose a meaningful present which matched your reference and hobby. I believe that you are pleased to receive it. Unfortunately, we are in the peak season of the year so I am extremely busy on numerous tasks at my work. On your birthday, a regular customer, who booked a conference at my hotel, changed her plan. Therefore, it messed up all my plans and the result was that I totally forgot your day.
If you give me another opportunity to correct my mistake, I will reserve a table at our favorite restaurant in town and invite you to come. We can celebrate your belated birthday one more time.
I hope you will give me another chance and I strongly believe that we will have a precious time together.
Best regards,
Huy Binh
