Synopsis: Aditya Kashyap (Shahid Kapoor), a demoralized industrialist, gets even more depressed after attending the marriage of the girl he loves the most. Feeling ashamed to face the world, he walks out of the marriage gathering and boards a train in the night. Over there, he meets Geet Dhillon (Kareena Kapoor), a beautiful talkative girl who is leaving Mumbai to go to her hometown - Bhatinda (Punjab).
In the beginning, Geet irritates Aditya to a large extent and every meeting becomes mental torture for him. She discloses big plans to him of eloping with her boyfriend Anshuman (Tarun Arora) as she fears resentment from her parents. Geet irritates Aditya to the point of getting him to leave the train. As she tries to get him back on the train, she ends up missing it and the two find themselves stranded on a desolate station with no luggage or money. Geet confronts Aditya and tells him that he is now responsible of reaching her safely to her house in Punjab. Both of them begin an idyllic journey through the exuberant North Indian heartland, and make their way through buses, taxis and camel-carts to reach her house.
On arrival, Geet's family (Pawan Malhotra, Dara Singh and Kiran Juneja) mistakens the two for lovers. Before this misconception can be cleared, Geet escapes to her boyfriend in Manali. Aditya leaves with her, confirming the suspicion that they are lovers. In Manali, Aditya feels empowered to return to Mumbai and resurrect his ailing business.
Destiny despises Geet's love story as Anshuman avoids and dumps her. On the other hand, Aditya begins to do well in life after he resurrects his failing business empire. One day, Geet's family, who think that she is with him, confronts Aditya. He is shocked to learn that Geet has not returned home. He takes it upon himself to find her and tells her family that he will bring her home in ten days.