Bonjour
répondre à une invitation en la refusant
INVITATION
My birthday is on Tuesday so I have a party next weekend with some friends. Would you join us ? There'll be a chocolate cake, some juice and candies.
ANSWER
That's very nice of you. I am really happy (that) you are inviting me. Unfortunately, next weekend I am going to visit my grandparents. It is going my grandmother's birthday as well ! I wish you a happy birthday .
bonne journée ☺☺☺