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: Tina was supposed to be home at 6 for dinner. Sentence2: When she didn't come home by 7, her mother was worried. Sentence3: Her mom called her best friend Lisa. Sentence4: Lisa said they were at the movies. Sentence5: Tina's mom picked up Lisa and grounded her for a month.
Lisa, Tina's mother, Tina