Context in a Watson's conversation is not working in the way It supposed to work

If I set the context object in a Watson's conversation I expect that it remains the nodes it previously visited I mean:

After firing an greetings' Intent, if I type 'bye' (a goodbyes Intent). It should fire a goodbyes's Intent but it just works in the test tool.

Here is the code in my Nodejs app:

let context = {}
const conversation = new ConversationV1({
    username: 'myUsername',
    password: 'myPassword',
    url: 'https://gateway.watsonplatform.net/conversation/api',
    version_date: '2017-05-26'
})

conversation.message({ workspace_id: workspaceId}, function (err, response) {
    if (err) {
        console.log(err)
    } else {
        context = response.context
    }
})

sendMessage = (message = null) => new Promise((resolve, reject) => {
        conversation.message({
            input: {text: message},
            workspace_id: workspaceId,
            context: context
        }, function (err, response) {
            if (err) {
                reject(err)
            } else {
                resolve(response.output.text)
            }
        })
    }

Although the conversation_id is always the same. I am always getting the anythingelse's Intent response instead of goodbyes' Intent.

{ intents: [ { intent: 'greetings', confidence: 1 } ],
  entities: [],
  input: { text: 'hi' },
  output: 
   { text: [ 'It is nice to talk to you, again !' ],
     nodes_visited: [ 'greetings' ],
     log_messages: [] },
  context: 
   { conversation_id: '7cc96494-d108-4dc9-95c4-63c174f20b4c',
     system: 
      { dialog_stack: [Object],
        dialog_turn_counter: 2,
        dialog_request_counter: 2,
        _node_output_map: [Object] } } }

{ intents: [ { intent: 'goodbytes', confidence: 1 } ],
  entities: [],
  input: { text: 'bye' },
  output: 
   { text: [ 'I didn\'t understand. You can try rephrasing.' ],
     nodes_visited: [ 'Anything else' ],
     log_messages: [] },
  context: 
   { conversation_id: '7cc96494-d108-4dc9-95c4-63c174f20b4c',
     system: 
      { dialog_stack: [Object],
        dialog_turn_counter: 2,
        dialog_request_counter: 2,
        _node_output_map: [Object],
        branch_exited: true,
        branch_exited_reason: 'completed' } } }

via Luillyfe