Belated congratulations on a marriage

Dear Rebbekah and Danny,

I'm sure that living in London certainly has its advantages. The one thing which can be troublesome is being far away from family and friends here in America. I want to apologize for not being able to attend your wedding there on Saturday, I honestly regret missing it and I do have the best wishes for the both of you.

I want to offer my congratulations to a pair of good friends for making the partnership between the two of you official. I know you will cherish each other and have a wonderful life together.