Dear Mr. Stevens：
Thank you very much for your kind invitation to the party celebrating the 24th anniversary of your company. Please accept my hearty congratulations on this remarkable occasion. We are very pleased that you have achieved great success in your sales during the past decades.
Unfortunately, my schedule in February will not allow me to attend this significant celebration. Urgent matters that cannot be rescheduled make it necessary for me to be in Berlin at that time. I certainly hope you understand the reasons preventing my attendance.
Thank you for the invitation again. I’m looking forward to the long-term smooth and close cooperation between our two corporations.
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