Greetings [Insert friend name here], I am glad we get to talk again. Reason for me contacting you at this time of day is because I have in fact been accepted to enter a writing competition for the local radio station. I was elated to hear this news and thought you might've wanted to hear about something this exciting. I'll try my best to win this competition for you, wish me luck!
Sincerely, [insert your name]
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Hope this helped! :)