Commucation strategy: using polite language

Hotel clerk: You're welcome.
                  Can you spell your last name,
                   please?
Ms.Cardoza: Yes, it's C-A-R-D-O-Z-A.
Hotel clerk : And what's your phone number?
Ms.Cardoza: It's (743)214-0091.
Hotel clerk : Ok. You're in room 235.Here's your room key.
Ms.Cardoza: Thank.
Hotel clerk : Thank you.Enjoy you stay.