What information do I need to fill out? You will need the volunteer's name, title, your organization name, and contact information.We Need You to Volunteer! The Dallas Arboretum Volunteer team consists of over 4,000 volunteers who contribute close to 100,000 hours of service each year. View adult and youth volunteer opportunities from the American Heart Association. Turn your interest into action, and take the next step today! Contact the UTDserv team prior to volunteering to confirm. Email confirmation letter will be sent once accepted or mailed if no email is available. To prove your voluntary work, you can obtain photographed proof or receive an all-mighty reference letter. Email confirmation letter will be sent once accepted or mailed if no email is available.