電話でアポを取り付けて欲しいというのは please call us for an appointment とか 例文のように invite you to call for an appointment と書けば良いでしょう。喜んで何々します という時に 英語では happy という言葉を例文のように書くことが少なくありません。I am happy for you などのフレーズは 耳にしたことがあるだろう。
It is a great pleasure to inform you that we will be introducing our new product line during the upcoming trade show - TechShow 2019 (March 22 - 25, 2019) in Chicago.
Attached please find a brief description of the new product line that will be introduced during the show. Detailed information will become available only for those who visit our booth during the show. Don't miss it!
We believe that you will be delightfully surprised to see some of our latest innovations in both concept and design, and invite you to call for an appointment to visit our booth (#412). We will be happy to arrange a demonstration time for you at your convenience.
Please call us at 123-456-7890 for an appointment. We will look forward to seeing you at the show.Best regards,