Hi, I'm Donald Scott.
Hello Scott, how may I help you?
 My convocation ceremony is being held in Phoenix, can you help me in booking a ticket from DTW to PHX?
Sure, please provide your itinerary dates.
My planned dates of travelling are from 12/13 to 12/15.
Sorry, no flight is available for you.
It's ok, no problem.
Thank you for availing our services.