Hi.
user
Hello. May I know, what kind of service you are looking for?
assistant
I am Virginia Martin, I am going to meet my parents after a long time, can you help in booking  a ticket from DC - DCA to IL - ORD.
user
Do you wish to book a flight?
assistant
Yes.
user
Sure. May I know your travel dates?
assistant
Sure, I would prefer travel on 03/22 to 03/24.
user
There are no flights available on that travel dates.
assistant
OK, thanks for your service.
user
We are unable to proceed for the ticket booking. Thanks for choosing us.
assistant