Mary, this company is pretty good. I really want to have an interview.
Have you made an appointment with this company?
Not yet. Do I have to?
Yes, it's very important to make an appointment before the interview.
Why?
If you go to the company without appointment, the interviewers may happen to be busy with other things, and have no time to give you an interview.
Yes, you are right.
If the interviewers are not in the company, you will go there for nothing.
Sure. Why didn't I think of that?
So you should make an appointment in advance with the company for the interview.
Then how can I make the appointment?
You could directly call the company and arrange the time and place for the interview.
Ok, I see.
If you succeed in doing that, you must attend the interview on time.