Would it be better if i change it to prototype style?

Would it be better if i change it to prototype style?

'use strict';

var obj = { year: 2017 }; // year is user input

function journey(a, cb){
    a.country = "go usa";
    cb(a);
}

function journey2(a, cb){
    a.person = "meet obama";
    
    if(checkObamaEvent(a.year)){
        a.metObama = true;
    } else {
        a.metObama = false;
    }
    
    cb(a);
}

function checkObamaEvent(year){
    return year >= 2009 && year <= 2016
}

function journey3(a, cb){
    if(a.metObama){
        a.quote = "Why can't I just eat my waffle?";
    } else {
        a.quote = "There's nothing to tell";
    }
    
    cb(a);
}

journey(obj, (a)=>{
    journey2(a, (b)=>{
      journey3(b, (c)=>{
            console.log(JSON.stringify(c));
      });
    });
});