I really enjoyed your writing and your sense of humor is very evident throughout this script. I also think you structured this story very well and you kept it going at a good pace. However, overall, I don't think the subject matter quite works for a screenplay. While this would be an exciting and funny story to tell at a party, it's a little too mundane for a movie, unless you add in some very profound and moving dialogue.
In order to make it a little more interesting, I think you could try and add more conflict within each scene. Some scenes, such as Marie talking to her roomate, tend to drag on a little. I also think Marie's conversation with Boppa on the train could be heightened for more interest. As it stands, Marie's inability to comprehend why she's so entitled kind of seems like millennial bashing (even though she is not a millennial). I think this scene could use more nuance in the dialogue regarding what they don't know about each other's lives.
One thing that could really benefit this story is giving Marie's character more of an arc. As the story stands, no one really changes and Marie doesn't learn anything except why she's entitled. I think there's more room for her to show how her trip with Boppa changes her.
I also would work on the dialogue between Boppa and Nanna toward the end. This is an important scene, but it leans toward cliche. I think this could be a lot more moving to the reader with a few tweaks to the dialogue.
A smaller thing to note-I would consider changing Mia's name. Mia and Marie are too similar and it can be a little confusing for the reader, especially before they get to know the characters.
