How is the office sign different at the end of the story in the book 'A Sound of Thunder'?

At the end of Ray Bradbury's "A Sound of Thunder," the office sign is altered to reflect a drastically changed timeline, showcasing the consequences of time travel and the butterfly effect. Originally reading "Time Safari, Inc.," it now ominously states "The Safari Is Cancelled," indicating a shift in reality brought about by the actions of the characters. This change symbolizes the profound impact of seemingly small decisions and actions on the course of history. The altered sign serves as a stark reminder of the fragility of time and the irreversible nature of their choices.