write an email

Dear Jane,

Thank you very much for inviting me to your company's Cocktail Evening next month.

I'm afraid I won't be able to attend because I will be on a business trip to San Diego at that time.

I'm particularly sorry that I won't be able to come because I particularly enjoyed last year's event. I'm sure that this year's party will be an equally big success.

Could you give me a call as there are one or two problems I need to discuss with you concerning our current contract? It's nothing very serious, just a few teething problems.

Once again, I'd like to thank you for your kind invitation.

Yours sincerely,

Brian Jackson