Misplaced your wife (SFW)

You're just married but in the train bringing you back home, you grab the wrong person in the crowd and realize that it's not your original wife you're holding the hand to. Thing is it's the 1980s, a time with no mobile phone nor internet to communicate over long distance. Where has your beloved end up ? Who is this other woman you mistake her for ? What are you going to do with her ? A comedy/romance scenario whose plot was inspired by the indian movie Laapataa Ladies.