Hi my name is John and need a viewing scheduled.
What apartment are you interested in?
I think I am looking at One on Center Apts and would love for it to be on Thursday around 5pm.
Have you already paid the application fee for the apartment?
I don't remember if I paid but I did remember I already have plans with a date on Thursday.
When would you like the viewing to start?
I will have to look closer at my schedule, things have been crazy lately. 
Would you like to add a message for the letting agency?
No that is ok but is Wed anytime good?
I have a viewing available on Wednesday at 1pm. Is that alright?
Great let's book it and crossing my fingers on my blind date Thursday!
Excellent, the viewing is scheduled now!
Thanks again have a great day.
Thank you and goodbye.