ConversationV1.URL = 'https://gateway.watsonplatform.net/conversation/api';

"https://gateway-fra.watsonplatform.net/conversation/api"

// Create the service wrapper
var conversation = new Conversation({
   username: '<username>',
   password: '<password>',
   url: 'https://gateway-fra.watsonplatform.net/conversation/api',
  version_date: Conversation.VERSION_DATE_2017_04_21
});