Well, I'm sorry we weren't aware! Consider dessert to have been an unintended but retroactively authentic congratulations and wish for a year of health, happiness, success and nachas.

It was a pleasure seeing you and having an opportunity to converse. I hope that on their return home your children delighted you with an explosively enthusiastic reunion hug. Or at least that they recognized you. :)

I now return to keeping in touch via one-way impersonal written communication.

Best wishes to C.