You are Rita/Ramesh Jain, a renowned author. You have been invited by the head librarian, Capital Library, to inaugurate a Book Fair for elementary school children. Draft a formal reply in not more than 50 words, declining the invitation, giving a suitable reason.
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A formal reply should acknowledge the invitation, clearly accept or decline, give a polite reason, and offer best wishes if declining.
Rita Jain sincerely thanks the Head Librarian of Capital Library for the kind invitation to inaugurate the Book Fair on 10 July 2025. However, due to a prior overseas commitment, she regrets her inability to attend. She wishes the event great success and enthusiastic participation.