Student or Learner
Julie(attendant) : ...there are many good things about the job. You know, you never know where you might be going. For example, I still get excited when I see the new roaster for the first time. Knowing I'll soon be off somewhere I haven't been before...
Does "roaster" mean "a schedule"? I can't find the definition in dictionaries.
not a teacher
This seems to be a misspelling of "roster": "A list of people's names, often with the jobs they have been given to do." (Cambridge Dictionaries Online)