<div class="form-inline">
    <div class="form-group col-sm-6">
        [text* first-name placeholder "First Name*"]
    </div>
    <div class="form-group col-sm-6">
        [text* last-name placeholder "Last Name*"]
    </div>
</div>
<div class="form-inline">
    <div class="form-group col-sm-6">
        [email* email placeholder "Email*"]
    </div>
    <div class="form-group col-sm-6">
        [text phone placeholder "Phone"]
    </div>
</div>
    <div class="form-group col-sm-12">
        [textarea message placeholder "Message"]
    </div>  
    <div class="form-group col-sm-12">
        [submit "SUBMIT"]
   </div>