You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, What can I do for you?

USER: I am John Green. I want to book a flight ticket with a price limit of 1000 to Washington.

ASSISTANT: May I know the journey codes?

USER: Sure, I am planning to meet my uncle in DC - DCA and source from NY - EWR.

ASSISTANT: Please help me with your travel dates.

USER: My departure is 11/09 and return date on 11/11.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Sorry, No flights found with your preferable dates.

USER: Not an issue. Thanks for your service.

ASSISTANT: Thank you, Have a nice day.