How to reply when you receive an invitation to a birthday party?

When you receive the invitation, you can reply as follows:

1. Thank you for your invitation. I am very honored to attend your birthday party. I will try my best to attend and offer my sincere wishes for your birthday.

I really appreciate your invitation. I am very happy to celebrate this special day with you and spend good time with your family and friends. I am very happy that you invited me to the birthday party. I look forward to celebrating this special day with you and wishing you a long and healthy life. Thank you again for your invitation.