Dear prof. wang,
I m writing to ask you to excuse me for not being able to keep our appointment. i do know that this is very impolite and must have caused you much trouble.
I do reckon that at present any explanation is pale and futile. however i do not want you to misunderstand me. on my way to your office, an old lady suddenly fainted due to heart attack on the bus. i stopped a taxi and sent her into a nearby hospital. i stayed there until her son came, which spoiled our appointment.
I am aware that our appointment is of importance. i do hope that you would be kind enough to spare your valuable to meet me.
I am looking forward to hearing from you.
yours,
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