code: public BoxRequestsComment.AddReplyComment getAddCommentReplyRequest(String commentId, String message) {
          BoxRequestsComment.AddReplyComment request = new BoxRequestsComment.AddReplyComment(commentId, message, getCommentsUrl(), mSession);
          return request;
      }
docs: Gets a request that adds a reply comment to a comment
  
  @param commentId    id of the comment to reply to
  @param message   message for the comment that will be added
  @return  request to add a reply comment to a comment