You had an appointment to meet you friend but you were not able to make it and you couldn't inform him. Write a letter - Apologize for not coming - Explain the reasons why you couldn't be there. - Tell him/her how you tried contacting him/her. Request another meeting.

Dear Hussain, I hope
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letter finds you in excellent health and best spirits. I am writing
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letter to apologize for not being able to meet you at the decided place and time. I know you are a little upset with me and I gave all the reasons for it but I deserve a chance to explain under what circumstances I was not able to join you at the location. On that day, I left for the venue before time but on my way, I got a call from my father that my younger sister encountered an accident and got admitted to hospital. It was really urgent to reach the hospital to see her. After receiving the news, I tried to call you several times but it was straight going to the voice mail and even I left a few recorded messages to you on your social media handle. I would love to reschedule our meeting for any upcoming weekend and
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time I will try to attend
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meeting under any circumstances. Once again, I am apologizing for not showing up. Hoping to hear back from you soon! Yours lovingly, Zenith

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Task Achievement
Make sure to clarify that the reason for missing the appointment is urgent and unexpected, which you did well. However, you could elaborate slightly more on how you felt about missing the meeting to enhance your apology.
Coherence and Cohesion
Your letter has a clear structure and each paragraph focuses on a single idea. To improve coherence, ensure that transitions between the paragraphs are smooth; for instance, include linking phrases to show the connection between your apology and the reasons provided.
Tone
The tone of the letter is warm and friendly, which is appropriate for a personal letter among friends.
Content
You've effectively conveyed your regret for not attending the meeting and explained the situation clearly.

Use a variety of complex and simple sentences

You should use complex sentences in your writing, but it does not mean that you should try to make all of our sentences complex.

‘Complex’ sentences are not actually very complex; they are just two or more simple sentences put together. Putting them together makes the essay more coherent and cohesive.

Examples:

I really want to study but I’m too tired.

I wore a warm coat because the weather was cold.

If action is not taken soon on climate change, global warming will get worse.

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