Serendipity(2001)

It's a bustling day in New York City, and amidst the usual mad rush, the paths of two strangers collide as they fall victim to a mutual, all-consuming attraction. Despite the fact that each is involved in another relationship, Jonathan and Sara bide their time, staying connected by wandering through Manhattan and talking until the wee hours, while never mentioning each other's names. But, when the night reaches an inevitable end, the two are forced to determine the next step. When the smitten Jonathan suggests an exchange of phone numbers, Sara has a different idea in mind that will allow fate to take control of the future. If they are meant to be together, she convinces him, the universe will reveal its telltale signs. At least that's the plan...