Supplement asks for me to write a letter; so what's the letter format?

[veshch]

<p>I'm not really sure how Americans would expect a student to write to her dormmate. I guess I can do the content, but I'm not sure about the letter format. Help?</p>

<p>Thanks in advance :)</p>

[Chedva]

<p>Dear Roommate:</p>

<p>[Enter text here]</p>

<p>Very truly yours, (or Sincerely, or Looking forward to meeting you, or something of that sort)</p>

<p>Your Name</p>

[veshch]

<p>Thanks for your help! :)</p>