To convince the reader that what they are writing about is true and correct, and to add a deeper meaning and depth to their writing.
Answer:
Dear sir/madam
I am writing regarding some books I am interested in purchasing. I would like to place an order for Hunger Games, Wonder and War Horse. I would be highly grateful if you could find the time to check if these are available and I am willing to pay an price within my budget of £10
I hope to hear from you soon
Many thanks
___________