You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: My name is Kevin Walker. I want to book a flight ticket on 06/15 to attend a conference in New York.

ASSISTANT: Sure, may I know your journey codes?

USER: My source and destination airport codes are DC - DCA, NY - JFK.

ASSISTANT: Do you need any connection in between your journey?

USER: I need a direct flight.

ASSISTANT: Can you please provide your return date?

USER: My return date is 06/17.

ASSISTANT: Thank you for the information, we are sorry to inform that there is no flight found matching your requirements.

USER: No issue, thank you for your service.

ASSISTANT: Have a good day.