your syntax for referring to form elements is not correct.
$emailFiled = $_POST('email');
$nameField = $_POST('name');
$phoneField = $_POST('phone');
$addressField = $_POST('address');
$hearField = $_POST('hear');
$travelersField = $_POST('travelers');
$commentsField = $_POST('comments');
needs to be changed to:
$emailFiled = $_POST['email'];
$nameField = $_POST['name'];
$phoneField = $_POST['phone'];
$addressField = $_POST['address'];
$hearField = $_POST['hear'];
$travelersField = $_POST['travelers'];
$commentsField = $_POST['comments'];