Wit.ai How to Get an whole sentence in an entity

I would like to store an entire sentence an user said and store it.

This his how I did but I can't get the sentence from A to Z an an whole entity, just few parts knows as "number", "location", ....

merge(request) {
    return new Promise(function(resolve, reject) {
        var entities = request.entities;
        var context = request.context;
        var message = request.message;
        var sessionId = request.sessionId;

        var intent = firstEntityValue(entities, 'intent');

        if (intent == "write_free_text") {
            context.free_text = request["text"];
        }
        if (intent == "choose_city") {
            var city = firstEntityValue(entities, 'location');
            context.city = city;
        }
        return resolve(context);
    });
}

How can I do that and store the whole sentence with merge function ? Thank you

If you want the whole sentence, maybe you don't needs a entity, just get the message sent:

// Merge action
function merge(request) {
  context.freetext = request["text"];
  return context;
}

Bot: https://wit.ai/Godoy/bottest/stories/4da2840f-513e-42ed-a494-c5516c07242e

Fiddle with code: https://wit-ai.github.io/witty-fiddle/?id=e4c16a624c87d37f9c0c29d8299ca5fc