Javascript load fresh form

I have a simple form which is opened within a modal when an anchor is clicked.

<a id="callbackLink" class="various" href="#inline">Request</a>

<div id="inline" style="display:none">
    <form id="callForm" onsubmit="callEvent(event);">
        <h3>Call Back</h3>

        <label for="Number">What number shall we call you on?</label>
        <input type="tel" id="callback-tel" placeholder=""><br>

        <input type="submit" value="Submit" />
    </form>
</div>

When the form is submitted, a third party library processes the form. If the form is successful, the form is removed and a success message is displayed in the modal.

Now if you close the modal and then click the button to display the form again, it will still show the success message. So I need a way of displaying a clean form every time the button is pressed.

What would be the best way to achieve this?