Hi.
user
Hello, how may I help you today?
assistant
I want to fly from LAS to DCA. Can you book a ticket from that route?
user
Sure, can I know your good name please?
assistant
Sure, Helen Nelson here.
user
 When you are willing to travel?
assistant
My planned travel dates are 09/19 and 09/21.
user
Do you need direct flight or connecting flight?
assistant
I want a flight with single connection.
user
 Would you let us know if you have any other preferences?
assistant
No more, thank you.
user
Sorry to say that, there are no flights available on the routes of your journey.
assistant
No issues, thank you for the information.
user
Thank you for choosing us.
assistant