What is the man’s purpose of being here?

W: Good evening, sir! Welcome to Dreamland Hotel. I am Cathy Lee. May I help you?
M: (5) Yes, I booked a single room three weeks ago. My name is David Arden.
W: How do you spell your last name, please?
M: It’s A-R-D-E-N.
W: Thank you, Mr. Arden. Please wait for a minute. I’ll check the arrival list... Yes, we have your reservation. Mr. Arden, a single room with bath. You have paid $50 as advance deposits. Am I right?
M: Yes.
W: Your room number is 505. It’s on the fifth floor. Would you please fill out this form while I am preparing the key card for you?
M: Yes. Should I write down my passport number here?
W. Yes. I am afraid you have to.
M: Here you are.
W: Let me. see... Oh, Mr. Arden, you forgot to put in the date of your departure. You are leaving on... ？
M: Well, Sep. 21.
W: Everything is all right now. (6) You will be staying in Room 505 from Sep. 19 to Sep. 21 for two nights. The daily rate is $ 60 per night. (7) Here is your key card with all the information about hotel services and rules and regulations on it. Please make sure that you have it with you all the time. You need to show it when signing for your meals and drinks in the restaurants and the bars.
M: OK. I’ll take good care of it.
W: And now if you are ready, Mr. Arden, I’ll call the bellboy and he’ll take you to your room.
M: Yes, thank you.
W: I hope you enjoy your stay with us.