Kind of SIRI in iOS. Looks Strange

Hi,
Below is the bird view of requirement, i don't know how to start it in Xamarin Forms.
My app name is Hello. Once i install that on my device. User takes the phone (without unlocking) and simply say like this. Hi HELLO send a message to Mr.X on Whatsapp. Automatically a message should be send to Mr.X in the contact of whatsapp. Kind of voice recognition app, but that should open other apps and do some work. Will it be possible to achieve the goal?