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When Oliver (Ashton Kutcher) and Emily (Amanda Peet) meet on an airplane, they feel an instant connection, but agree that they're wrong for each other. As the years pass and they live their separate lives, fate brings them together several times, and they become close friends. Any time one of them wants more out of the relationship, the other seems content with just being friends. If they wait too long, Oliver and Emily may miss any chance of spending their lives together. Wikipedia