Samsung Galaxy Note 3 — SIRI App - Android

Why don't you use Google Now?

I think like Hamid better with Google Now but you can test... More...

Microsoft's cortana
http://www.apkmirror.com/apk/microsoft-corporation/cortana/cortana-en-us-1-0-0-222-android-apk-download/

Sherpa Asistant
http://sher.pa

And any you imagine at Google play
https://play.google.com/store/search%3Fc%3Dapps%26q%3Dsiri%2Bassistant%2Bandroid%26pcampaignid%3DAPPU_4_tDzVVZigM4vpauuQktAF&ved=0CCsQzTBqFQoTCJjKuezPtscCFYu0Ggoda4gEWg&usg=AFQjCNG2AJZjRC75gYlmr4ZYAprnIjq98Q&sig2=pdMR9_5K_Cynz9xjee4whQ

Hey, you can design customize app like Siri!

There is no SIRI App for your Android phone. Why?
- The name Siri is patented by Apple. So if there is an app working exactly like Siri, it can't be named "Siri"
- Siri works well because it is an app developed by Apple, and integrated into Apple devices --> They work together so well. So if there is an app working exactly like Siri, it would not perform in Android devices well as you expect.

But there are Siri-like Apps for it. Which one is good?
In my experiences, Google Now and Skyvi are good. But I see that you don't like Google Now so let's talk about Skyvi
The app has all the features you would expect from a good virtual assistant. What sets Skyvi apart is the way those features are implemented. Clean and clear interface helps avoid confusion for less tech-aware users. Voice texting, fast find and call, getting directions and calling contacts is easy as one to three with Skyvi.