I have recently learned from my darling friend and future sister that you have asked after my health. I have to say that it surprised me, as we haven't yet met, but it was a pleasant surprise. I am faring much better than I was only a few days ago, though it seems the cough still lingers. The doctor has said this is perfectly normal and it will clear up on its own soon.
I would like to invite you to join us for dinner some evening. At your convenience, of course. I think you and my fiance, and his sister will have a great deal to talk about.
I hope to hear from you soon and once again, thank you for your kind concern.