Both Arjun and Aaradhana were starting from different points but their motive was to escape their daily tiring work life and to travel and explore.
As they landed, in Goa they both were approached by same guide who accepted half the money than other guides to navigate them. That's Arjun met Aaradhana.
So the guide that accepted half cash was actually a thief associated with a mob of local gangsters, his plan was stole their luggage and did so on the way to their hotel. Both Arjun and Aaradhana were totally shattered, speechless.