'I' is identified with soul. What is connection between soul, body and mind?

As it is stated in Gita, Soul or 'I' is the passenger who wants to reach its destination. What is that destination? The destination is the city of happiness.

To reach the happy-city soul is given a vehicle of this body.. Intellect the driver and decision maker which decides way the vehicle moves. Mind is the steering that changes the direction of motion of the wheels or senses.

Now the problem is intellect, mind and body and senses are of material or mayic origin while soul is divine.

The intellect decides 'What I want?' Everyone decides the aim by weighing only one factor - 'What will satisfy me the most?' The answers to this question are many ..
'I want to be a doctor.'
I want to be an engineer.'
I want to a model.'
I want to be a sportsman.'
I want to be a politician.'
I want to be an actor-actress.'
There is no end to the options. But the underlying factor that decides the course of action is the urge to be happy.