This is a sample of slack bot for doing anonymous posting.

anonypost_bot_sample.js

// Posting anonymously botn sample
// Confirm whether to submit a post => yes / no
controller.hears(['anonypost (.*)'],  ['direct_message','direct_mention','mention'], function(bot,message) {
  var matches = message.text.match(/anonypost (.*)/i);
  var anonypost = matches[1];
  bot.reply(message, 'I will post this content anonymously. Is it OK? =>  ' + anonypost );
  bot.startConversation(message, function(err, convo) {
    convo.ask('yes / no',
      [
        {
          pattern: bot.utterances.yes,
          callback: function(response, convo) {
            convo.say('I posted this content anonymously!');
       
            bot.startConversation({channel:"Your channnel"}, function(response, convo) {
              convo.say("[anonypost! :mailbox_with_mail:]" + anonypost);
            })
            convo.next();
          }
        },
        {
          pattern: bot.utterances.no,
          callback: function(response, convo) {
            convo.say('OK! Post canceled!');
            convo.next();
          }
        },
        {
          default: true,
          callback: function(response, convo) {
            convo.say('Please answer yes or no');
            convo.repeat();
            convo.next();
          }
        }
      ]);
  });
});