“Casablanca”

Casablanca is a 1942 American romantic drama film, starring Ingrid Bergman and Humphrey Bogart.
The film is set during the early stages of WW2: the Nazis have invaded much of Europe and are going to invade the rest. Therefore many Europeans try to get to America, but first they have to go Casablanca, which has become a crowded town filled with refugees who want to obtain exit visas

It is the story of Rick Blaine, a cynical world-weary expatriate who runs a nightclub and gambling den in the Vichy-controlled city of Casablanca. Morocco.
Despite the pressure he constantly receives from the local authorities, Rick’s cafe has become a kind of haven for refugees seeking to obtain illicit letters that will help them reach the still-neutral United States.

But one day Ilsa, a former lover of Rick’s, arrive at his café. Ilsa asks the pianist, Sam, to play a song: “As Time Goes By.”, but Rick first gets furious because the musician has disobeyed his order never to perform that song, then gets shocked to see Ilsa, accompanied by her husband, Victor Laszlo, a renowned fugitive Czech Resistance leader. They need the “letters of transit” to escape to America where he hopes to continue his work. Some of Rick’s old wounds reopen: it is obvious that his stone heart was due to her leaving him.
Rick has come into the possession of two of those valuable letters, but he refuses to give them to her . He is  very bitter towards the woman because she left him when they were in Paris, but then he learns she had good reason to do so.
Ilsa tries a new approach by turning a gun on him, and then agrees to remain with him if he uses one of the letters of transit to help Victor escape from Casablanca to continue his fight against the Nazis.
Next, it is Laszlo who is aware of Rick’s love for Ilsa and tries to persuade him to use the letters to leave and take her to safety.

After other complications, heartbreak and painful decisions to make, at the last moment, Rick makes Ilsa board the plane to Lisbon with Laszlo, telling her that she would regret it if she stayed—”Maybe not today, maybe not tomorrow, but soon and for the rest of your life.”