A direct letter is used to confirm appointments, deliver good news, and exchange routine information. A direct letter gets right to the point and is usually one paragraph.
Look at the layout here. Make sure you look at the second page, which explains the margins and spacing etc.
DIRECT LETTER ASSIGNMENT:
Write a letter to Ms. Judy Bolin of Havercrone Industries confirming a meeting. Make sure you include all of the information she would need to actually get to the appointment. Remember sentence flow and good paragraphing. Make up any unknown information.