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.
Q: Sentence1: One day Jackson went to Roswell, New Mexico. Sentence2: First he went to the UFO Center. Sentence3: Then he went to the Bottomless Lakes State Park. Sentence4: Then he stargazed for UFOs, but didn't see anything. Sentence5: He had a great time.
A:
Jackson