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.
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Question: Sentence1: Anna was sick of her three TV channels. Sentence2: She called the cable company and made an appointment. Sentence3: Then they came to her house and set up her cable. Sentence4: She was excited to check out her new channels. Sentence5: Anna decided she was going to love having cable!

Answer: Cable company, Anna

Question: Sentence1: Dave was a scientist. Sentence2: Dave wanted to make a great scientific discovery. Sentence3: Dave worked with algae to make electricity. Sentence4: Dave discovered he could make electricity with algae! Sentence5: Dave was awarded for his great discovery.

Answer: Dave

Question: Sentence1: Jack buys a PS3 on Ebay. Sentence2: When the console arrives it is a PS4, not a PS3. Sentence3: He lets the seller know about the mixup Sentence4: The seller lets Jim keep the more expensive PS4. Sentence5: Jim is glad that his honesty paid off.

Answer:
Jim, The seller, Jack