Hello, I would like to schedule a viewing for North Hill for Sunday at 10 pm
Can I have your name?
Ben
Have you already paid the application fee for the apartment?
I do not know. 
I am sorry, but there is no viewing available at your preferred time.
I just remembered I have a job interview on that day. We need to change it. Can we do Monday?
I am sorry, but there is no viewing available at your preferred time.
Tuesday, or Wednesday?
I am sorry, but there is no viewing available at your preferred time.
Anytime on Monday, Tues, or Wed is fine. 
I am sorry, but there is no viewing available at your preferred time.
What time or day is available?
No day is available. Would you like to change the time?
yes, please change time
For how long would you like to see the apartment?
1 hour
When would you like the viewing to start?
anytime that is free 
Great, there is still a viewing available at that time. Would you like me to book it for you?
What day and time is that?
Wednesday at 10 am
perfect. Book it
Excellent, the viewing is scheduled now!