Here's what happens after the climax of the story:
* The climax: The man finally builds up the courage to talk to the woman, but she's already gone.
* Resolution: The woman, who is on a train, sees the man throwing paper airplanes to her from the platform. She realizes the man is the one she was smiling at.
* The End: The short ends with the woman looking out the window, smiling at the man, and the man smiling back, realizing they have a connection.
There is no explicit falling action, but the ending itself can be considered the falling action. The climax ends with a bit of disappointment for the man, but the final scene resolves the situation by showing their connection.
The story's resolution and the ending are considered "falling action" in a broader sense, because they show the consequences of the climax and provide closure to the story.