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: Last year, I broke a drinking glass in my bedroom. Sentence2: Because I was tired, I placed it next to my bed. Sentence3: I told my girlfriend I would take care of it in the morning. Sentence4: Within one minute of waking up, I stepped on the broken glass. Sentence5: I had to go to the hospital to get.
I (myself), Girlfriend