Given the task definition and input, reply with output. In this task, you're given a story (which contains five sentences only). Your task is to find all the characters which are available in the given story.

Sentence1: Carrie has been secretly dating a married man for some time. Sentence2: She was afraid to tell her best friend. Sentence3: One day her best friend saw her leaving Starbucks with her date. Sentence4: She asked her later on who he was. Sentence5: She told her and was surprised she was not upset.
Carrie