Short and Simple Formal Declining of Invitation

Miss M. Khate thanks the ABC company for their kind invitation for Official Opening on Monday 8^th April but regrets that he is unable to accept the invitation since he owned a previous engagement. Please kindly accept the apologist.

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This is a hand writing declining of invitation. It is very short but enough to reject. You do not want to cover much about the reason why you can’t join the events.