Definition: In this task, you're given five sentences, numbered 1 through 5. Your job is to generate a title for the story that makes complete sense. The title must be short, with less than three words, use simple language, and include the main topic of the story.
Input: Sentence 1: Regina had forgotten to call her best friend. Sentence 2: It was her friend's birthday. Sentence 3: She tried to call her friend no one answered. Sentence 4: Regina decided to stop by her friend's house. Sentence 5: She was surprised to discover her best friend was out of town.

Missing Birthday Girl