Hello.
user
Hello, do you need any help from us?
assistant
Can you  please book a flight ticket from IAD to LAS?
user
Sure, could you please share your departure and arrival day?
assistant
Thank you. I have planned my travel  dates as Dec 17 and Dec 19.
user
Ok, could I have your name please?
assistant
Sure, myself Angela Moore.
user
Ok, do you need direct or connecting flight?
assistant
I am  looking for single connecting flight.
user
Sorry, there is no flight on your requested travelling dates.
assistant
Oh! It is sad to hear. Anyway, thank you for your  time.
user
You are welcome, have a great day.
assistant