Dear Charlie,
Kindly excuse me for my not being able to see you off at the airport this Saturday as I have promised.
A major business partner of our company pany him there to negotiate about a neplishment of your dream. Hoe reasons, you can not meet him at the airport on time. Write a letter asking to orrow to show my best wishes. Besides, please give my regards to our friends when you meet them at the party.
Cordially,