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How to invite :
Dear my beloved friend

Oh yeah, I would like to invite you come to my 21th birthday! Bring your sincere present

Place: Dapur Putih Restaurant
Dress Code: White Casual Dress
Time: 09.00 p.m – 12.00 p.m
Day/Date: Saturday Night/1 Mayst  2015
I’m waiting for your coming! Come before 09.00 p.m and wear your White casual dress!

Thank for your nice attention friend

My sincere greeting,

Amy

How to accept :
*Great! I would like that very much.
*Nice! I would really like that.
*I would love it.
*Thank you for your invitation. I would go with you.

How to refuse :
*Thanks for your invitation, but I may be busy.
*May be some other time. It’s doesn’t matter, right?
*That’s good idea. But I am sorry I can’t go.

Hope it helps:)