Pulling just the first name from the full name field for the auto responder email

I have a payment form, and when someone fills in a full name field, it updates the name field on the payment form. The trouble is, I can't figure out how to use only the first name when constructing my autoresponder email. Is there a trick I'm missing? Here is the form: https://form.jotform.com/63334475371154 

You can do it by following this user guide: How-to-Strip-Headers-from-Postal-Addresses-in-Email-Alerts 

For the Full Name compound field, to display only the first name do it like this {fullname:first}

if for last name.. {fullname:last} 

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

Thanks.