Question

What are some of the things you can do to make a friendly letter sound conversational?

Answer 1

tell them a little about yourself, explain your interest and make it seem acknowledge

Answer 2

SOS:

Using contractions, slang terms, and colloquial expressions. Pretty much, write the way you talk. Calling your friend by name in the body of the letter. Underlining words for emphasis. Using expressive punctuation.

Hope this helps!