answer: The doctor tells #Person1# to be hospitalized for at least one day for observation.
documents: #Person1#: I guess you should know that you need to be hospitalized.
  #Person2#: Of course I know.
  #Person1#: Now you can go to the in-patient department to go through the admission procedures.
  #Person2#: OK. I'll go right now. By the way, do you think I'll have to stay in the hospital for long?
  #Person1#: It's hard to say. It depends on your recovery condition. But you need to stay for at least one day for observation.
  #Person2#: Thank you, Doctor. I will go now. Bye-bye.
  #Person1#: Bye!