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: Tim had a helium balloon. Sentence 2: He accidentally let go of it. Sentence 3: It started to fly away. Sentence 4: Tim tried to chase after it. Sentence 5: Unfortunately it was gone before he knew it.

Lost Balloon