answer: Mr.White asks John to come to his office to know more about Mr.White's house for sale.
documents: #Person1#: Hello? This is John Smith.Can I speak to Mr.White, please?
  #Person2#: This is Mr.White speaking.
  #Person1#: Hi. I understand that you have a house for sale, haven ' t you?
  #Person2#: Yes.
  #Person1#: I ' d like to know more about it.
  #Person2#: Can you come to my office this afternoon at 3 o ' clock?
  #Person1#: OK. I will be there.
  #Person2#: Thank you for calling.Goodbye.
  #Person1#: Bye.