You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Mark Hernandez.

ASSISTANT: How can I serve you?

USER: I need to book a ticket to meet a organising event people on 03/23 from IAD. Could you please help me in doing that?

ASSISTANT: Sure, I can help you. May I know your destination airport code?

USER: I intend to return on 03/25 from JFK.

ASSISTANT: Do you need any connection?

USER: I need a connection in between the journey.

ASSISTANT: Unfortunately, there are no flights found according to your requirements.

USER: No problem, thank you for your valuable information.

ASSISTANT: Ok. Thank you .