answer: #Person3# tells Ken that they play their stereo system very late last night. Ken feels sorry and promises to keep it down next time.
documents: #Person1#: Hi.
  #Person2#: Hi, Mary.
  #Person3#: Hi, Ken I hate to bring this up, but that new stereo, system you got. . .
  #Person2#: Yeah?
  #Person3#: You were playing it very late last night.
  #Person2#: Yeah?
  #Person3#: It kept me awake.
  #Person2#: Oh, I'm sorry.
  #Person3#: It kept me awake a couple of hours.
  #Person2#: I'm so sorry, I. . I didn't realize it was that loud.
  #Person3#: It was that loud, and it was pretty late, and check with Mary if you don't believe me.
  #Person1#: It's true. It was a bit loud.
  #Person2#: I'm very sorry. I didn't realize it. I promise I'll keep it down in the future.
  #Person1#: Oh, it's no problem. It's OK. You know, it only happened once.
  #Person2#: I am glad we've straightened everything out.