It will give us much pleasure to dine with you on Thursday the seventh, at eight o'clock.
Thanking you for your kind thought of us,
Sincerely yours,
Margaret Smith.
Wednesday.
or
Dear Mrs. Town:
My husband and I will dine with you on Thursday the seventh, at eight o'clock, with greatest pleasure.
Thanking you so much for thinking of us,
Always sincerely,