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: Ronald wants to think of something to do with his friends. Sentence2: He decides that he would like to go bowling with them. Sentence3: They go to the local bowling alley in the afternoon. Sentence4: Ronald bowls very well. Sentence5: He is happy that he found something to do with his friends.
Ronald, His friends