Dear Linda,
How have you been during these days?
I'm sorry to tell you but I can't go to Nanjing during the winter vacation to spend a week with you, because I just learnt that I will have an important exam to take at the beginning of next term. So I have to study hard for it during the holiday. That's why I'm writing to you to cancel this trip.
I apologize sincerely to you for not keeping my promise, and I hope I could make up to you somehow after my exam. Hope to hear from you very soon.
Best wishes,
Your friend, XXX
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