Get Facebook User Name

GetFBUserName.js

const axios = require('axios');

function getFacebookData(){
    const PAGE_ACCESS_TOKEN=`YOUR_PAGE_ACCESS_TOKEN`;
    const fb_id = request.body.originalDetectIntentRequest.payload.data.sender.id;
    return axios.get(`https://graph.facebook.com/v6.0/${fb_id}?fields=first_name,last_name,profile_pic&access_token=${PAGE_ACCESS_TOKEN}`);
}

function welcome(agent) {
    return getFacebookData()
    .then(res => agent.add(`Hello ${res.data.first_name}`);
}

Thank you Anshul