You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: Can you help me to book flight ticket from ORD to JFK?

ASSISTANT: May I know your desired travel dates please?

USER: My planned dates are Apr 4 and Apr 6.

ASSISTANT: May I know your name please?

USER: Jennifer Lewis here.

ASSISTANT: Do you have any specifications?

USER: I need a direct flight.

ASSISTANT: Sorry to say, there is no flight on your desired travel dates.

USER: No problem, thank you.

ASSISTANT: Thank you for opting us.