Create thank you email

If I understood you correctly you want to send thank you note via email to your users when they submit your form. You can achieve that by creating a Form Autoresponder:

http://www.jotform.com/help/26-Creating-a-Form-Autoresponder 

If you do not want to sent your users submitted data you can remove table from Autoreponder email and write your own custom Thank You message. 

Hope this will help. Let us know if you need further assistance.