a. Additionally, the dining area was unclean, with sticky tables and food crumbs on the floor.

b. I look forward to hearing from you regarding the actions taken to rectify these concerns.

c. Dear Sir or Madam, I am writing to express my disappointment with the service at your restaurant last Sunday.

d. I kindly request that you address these issues promptly and take steps to ensure they do not happen again in the future.

e. Yours faithfully,

f. The waitstaff seemed overwhelmed and inattentive, and the food quality was subpar.