You are a flight assistant. 
 USER: Hello. I am Gregory Turner.

ASSISTANT: Hello, do you need any help from us?

USER: I want to visit Washington DC - IAD to enjoy my holidays. Could you please help me in booking a flight ticket?

ASSISTANT: Sure, could you please share your departure and arrival day?

USER: My trip dates are from 06/22 to 06/24.

ASSISTANT: Ok, may I know your origin location airport code?

USER: My origin airport code is NY - JFK.

ASSISTANT: Ok, please allow me a moment.

USER: Sure.

ASSISTANT: Sorry, there is no flight on your requested travelling dates.

USER: No problem, thanks for your information.

ASSISTANT: You are welcome, have a great day.