Where did the applicant get the information about the job vacancy?

Applicant: Good morning, sir. It’s very nice to meet you. I’ve come for an interview.
Manager: I see. Good morning. Take your seat, please.
Applicant: Thank yon. I received your letter yesterday, and you told me to come this morning for an interview.
Manager: Oh, so you are Mr. Smith, and you are one of the applicants to have answered our advertisement in the paper for an assistant account. Yes, we do have a vacancy, and I am expecting you.
Applicant: Thank you very much ,sir. Nice office here. I suppose your company’s business is very good.
Manager: Well, not bad. May I see your reference materials? Frankly speaking, I’m quite satisfied you’re your qualifications since you have six years’ experience in office work. I consider you the right man for this position. By the way, what company are you working with now?
Applicant: Well, I am out of job for the time being. 1 used to work in a Chinese firm whose boss was the sole proprietor. But two months ago the boss went back to China with his family, so the firm was closed down.
Manager: Does it mean that you can come here to work any time on call if we hire you?
Applicant: That’s right. By all means.
Manager: I think you understand that we’ll have to take you on a three-month probation first.
Applicant: Of course, I understand. I’ll do my best, and I think I can do a good job. By the way, what is the salary?
Manager: One thousand and five hundred dollars a month to start with, and in three months’ time your salary would be adjusted. And a year from now, you will have two weeks’ annual leave.
Applicant: That’s great. And when shall I start to work?
Manager: Let’s see--today is Friday. You may start working on Monday. What do you say to it?
Applicant: I think it’s the best. Thank you very much, sir.
Manager: Good luck to you.