Dear Bill
I accept your invitation. I will come at 7 o'clock because I will busy with my children until 6:30 pm. Steve can't come because he will be still at the work.
Could you ask the restaurant, if they have vegetarian food?
I will also go to the cinema with you. It is amazing.
I already have a present for Mary.I am not worried about that.
Thank you for inviting me.
 See you there
Regards
Azhar