decline invitation

[NAME]

[TITLE]

[ADDRESS]

Dear Mr. Man, 

Thank you very much for inviting Mrs. Ledbetter and me to attend the Union-Houghton dinner on August 8. We would like very much to be your guests, but unfortunately we have other plans. 

Shall we make it another time?

Best Regards,

[Signature]

[NAME]

[TITLE]