Omer Travels — male passenger next to female

Address:

Marathalli, 560037

I’m a female passenger. While i was traveling from bangalore to hyderabad, the lady sitting next to me left in between without completing the journey, due to which they had a vacant seat in bus. And when the bus halted at hebbal, they made a male traveler sit next to me.
If this is how it is going to be, what is the purpose of color codes and gender preferences at the time of booking?