You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am John Green.

ASSISTANT: How may I assist you? Nice to meet you John.

USER: I am planning to visit one of the best place in Washington DC-DCA, can you please assist me in booking a flight ticket from NY-JFK?

ASSISTANT: Yes, please I will help you with flight ticket booking. May I know your travel dates please?

USER: My travel dates are 06/28 and 06/30.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Thanks for time. But I am sorry to say that presently there are no flights available.

USER: Ok, no issues.

ASSISTANT: Thank you.

USER: Thank you.