Hi, I need to make a doctor's appointment. 
Could I have your name, please?
My name is Mark and I'd like to see a doctor as soon as possible today.
What doctor would you like to see?
I'd like to see Dr. Alexis, she's been my primary care doctor for two years. 
What day of the week would you like to schedule the appointment for?
Today, Friday, ASAP please. I've been sneezing so much my wife's told me I should go see a doctor. 
What time?
Is she available now? Anytime from 5 pm to 8pm please.
Alright, Dr. Alexis is available at 7 pm. Can I book the appointment for you?
Oh yes! Can I bring my son John to get a vaccination after me?
Great, your appointment with Dr. Alexis is booked for you!
Great! Thanks a lot!
9PM is available for your child. Shall I book?
Yes, please do. 
Great, your appointment with Dr. Alexis is booked for you!
Ok, thanks bye!
Thank you and goodbye.