创建新的聊天对话框（私人）

QBChatDialog dialog = DialogUtils.buildPrivateDialog("USER_ID of other user");
        

        QBRestChatService.createChatDialog(dialog).performAsync(new QBEntityCallback<QBChatDialog>() {
            @Override
            public void onSuccess(QBChatDialog result, Bundle params) {
              //if dialog created successfully
              //result param return all details about that dialog
            }

            @Override
            public void onError(QBResponseException responseException) {
              //error creating dialog 
            }
        });