Here is an email: Due to a scheduling conflict, it has become necessary to cancel the dinner  meeting scheduled for August 2, 2000 at the River Oaks Grill. This meeting  will be re-scheduled at a later date. If you have any questions or concerns, please feel free to contact either Kay  (30643) or Beverly (57857). Thanks very much. 
What is a potential subject line for this email?
Dinner Meeting on August 2, 2000