How would you politely say maybe? Your new to your neighborhood and one of your neighbors has invited you to their annual holiday party.What's the best way to reply to a meeting invitation email? Read our tips and use our email format and samples. Write your invitation in minutes: Easy step-by-step guide with sample sentences and phrases. 1 Express your pleasure at being invited and accept the invitation. A contract acceptance letter is a formal letter that confirms that you have accepted the terms and conditions. Here's what you should know. Express your gratitude for the invitation, confirm your attendance or decline with a genuine reason, and provide any necessary information requested. First and foremost, writing an acceptance letter is a polite and professional way to acknowledge the invitation and express your willingness to attend.