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If you will setup your Email notifications, you'll see in the "Provide Sender and Recipient Details" the "Reply-To Email" field, you should have an email field that will be filled out by the user of your form. If you setup this, it will allow you to directly reply to the users email address via the notification you received.
If you are looking on to have an auto-reply email when the user submits the form, then you can setup an autoresponder. Here's a guide on that: http://www.jotform.com/help/26-Creating-a-Form-Autoresponder.
I hope that helps.