Hello.
user
Hello. How can I aid you today?
assistant
I want to travel from IAD to OAK. Can you help me to book a flight ticket?
user
Sure, I will help you with that. Can you please share your preferable travel dates?
assistant
I want to fly in the flight on Apr 22 and Apr 24.
user
May I know your name please?
assistant
David Carter.
user
Do you have any class preference?
assistant
I prefer to travel in economy class.
user
Would you like to board a connecting flight or  direct flight?
assistant
I am looking for a connecting flight.
user
Do you have any other specifications?
assistant
I want to return in afternoon time.
user
There are no flights available on this route as per your travel dates.
assistant
That's ok. Anyways, thank you.
user
Thank you for reaching us, have a great day.
assistant