Dear 马瑞,
I would like to express my apologies for I was out when you came to see me yesterday afternoon. The fact is that I had an engagement to ignorant of your visit,. You must have been disappointed by my absence.
As this is the first time you come to Beijing, Would you please let me know when you are free and i will meet you at theappointed time.
Yours faithfully,
(Your Name)
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