Dear Mr./Madam,
I write this letter to talk about my disappointment in the treatment I received tonight at your restaurant.
When I first came in, I was unhappy to find out that the table I made in advance was already taken by someone else. I had to sit down at a table that was dirty and the staff cleaned it only when I wanted to sit there.
Secondly, I did not have many meals to choose from. The waiter told me he could not offer me the kind of food I ordered.
Moreover, I would also like to complain about the incompetence of your staff. When bringing the tray he poured the juice on my dress.
Sincerely, I do not think I wll ever go into this restaurant again.
Yours faithfully,