Hello.
user
Hello, how may I help you today?
assistant
I am planning to book a flight ticket to IAD from EWR, can you please help me out?
user
Sure, can I know your good name please?
assistant
Sure, my name is Andrew Collins.
user
 When you are willing to travel?
assistant
Sure, my trip dates are Sept 12 and Sept 14.
user
 Would you let us know if you have any other preferences?
assistant
I prefer direct flight.
user
Sorry to say that, there are no flights available on the routes of your journey.
assistant
It's ok, thank you for the information.
user
Thank you for choosing us.
assistant