You missed attending a friend's invite. Write a letter to your friend: apologize for not coming; explain how you tried to contact him/her; suggest an alternative plan.

Dear Mary, how are you doing? I hope you’re doing well. How about your birthday party? I saw it on your social media. But I’m really sorry, I can’t attend your birthday party. I’m so sorry I couldn’t attend to your birthday party. I really wanna go to your birthday party, But at that time, […]

Dear Mary, How have you been? I hope you’re doing well. How was your birthday party the other day? Was it fun? I saw your posts on social media, and it looked like you had a great time. I’m really sorry I couldn’t make it to your birthday party. I had already planned to come […]