you have missed your friend's birthday party: apologise for missing the party and explain why you couldn’t go:-ask your friend how the party was:-suggest meeting your friend to give him or her their present

Hello my dear friend, I could not come to your birthday, because I was sick very much.I am very sorry for this, and I'm sure that we'll celebrate your birthday.I want to ask you how you celebrated your birthday?I want to know how everything went, my it is also interesting, to tell me who came to celebrate with you? I have a gift I want to meet with you to give it to you, write or callwhen read this.

Dear (имя друга) I'm so sorry, but I can't go to your birthday party. Because my aunt has got a birthday party too. So I and my family have to go to her Birthday party. Because she's 30 today! But don't worry about me. I hope you will have fun. So don't be sad cause it's your birthday and your day. Anyway I wish you happiness,health,good marks and all that you want! Love you! Your friend(твое имя)