AC Drain in Nissan Sentra SR 2014

My car have water on the passenger floor for sometime. All the while I was
mistaken the slush sound of water for a mineral water bottle got stuck under
the front passenger seat,

Brought my car to get the AC drain checked out but my mechanic seems not
be able to find the AC drain (tube?) below the car.

Tried researching the internet, was not lucky either. Can anyone point to
where is exactly this tube is under the car?

I am not exactly bright when comes to car. Learning things slowly.