How to send a text message apologizing for difficulty in attending an appointment, in ancient language

We have heard that you are invited, and we are delighted and honored. A goodbye for many years, every time I think of my old friends and classmates do not feel tears, hate not to see each other. However, the world every providence, not manpower can be salvaged, when I want to gladly go to the appointment, suddenly met with his urgent and difficult to get away, as if falling from a height, the heart as fire, but also sigh of helplessness. Today, it is difficult to go, really negative gentleman's hospitality; he had the honor of the next day, will be with the marigold with the joy. I'm sorry for any inconvenience this may cause.