You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: This is Barbara Moore from Washington. I have a plan to attend seasonal festival with my family friend's in New York, so I need to fly from Washington. Could you please aid me in booking a flight ticket?

ASSISTANT: Sure, may I know your airport codes?

USER: My airport codes are from DC-IAD to NY-JFK.

ASSISTANT: When do you want to travel?

USER: I want to travel on 03/17 from Washington.

ASSISTANT: May I know your return date?

USER: I intend to return on 03/19.

ASSISTANT: Wait a minute.

USER: Sure.

ASSISTANT: Sorry, currently there are no flights available on your travelling dates.

USER: Ok, no issues. Thank you for your great service.

ASSISTANT: Thank you for choosing us.