Write a confirmation letter

A request letter.
Dear Bang,
I will have a birthday party at 8:00 p.m on Saturday in my house. I invite to you to go to the party.
Can you go shopping with me to buy two bunches of bananas, three kilos of oranges, ten mangoes and bring them to my house an hour before the party.Can you help me ?
Please let me know as soon as possible.
Yours,
Linh

A confirmation letter.
Dear Linh,
I'm very happy because i'm invited go to the party.
At 8:00 p.m, on Saturday. I have free time. So i will help you to prepare things you need for the party.
I'll be waiting for you at 8:00 p.m on Saturday.
Love,
Bang