var watson = require('watson-developer-cloud');

var conversation = watson.conversation({
  username: '{username}',
  password: '{password}',
  version: 'v1',
  version_date: '2016-07-11'
});

conversation.message({
  input: {"text":"turn on the lights"},
  context: {"conversation_id": "1b7b67c0-90ed-45dc-8508-9488bc483d5b","system": {"dialog_stack": ["root"],"dialog_turn_counter": 1,"dialog_request_counter": 1}},
  workspace_id: '25dfa8a0-0263-471b-8980-317e68c30488'
},  function(err, response) {
  if (err)
    console.log('error:', err);
  else
    console.log(JSON.stringify(response, null, 2));
});