Travelmatic demo uses  Contact form 7 plugin for contact form and it’s recommended one.

  1. Go to Contact → Add new (or edit current one) and in Form field paste what’s below:
     [text* text-120 placeholder "Name"]
     [email email-613 placeholder "Email Address"]
    [textarea textarea-37 placeholder "Message"]
    [submit "Send Message"]

  2. Then at the top of page you’ll see shortcode, for example  (it will have different ID on your website):
    [contact-form-7 id="123" title="Contact form 1"]

    Use it on a page where you want to have contact form.