You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I aid you?

USER: My name is Margaret Allen, I want to book a flight ticket for attending my friend's birthday party.

ASSISTANT: Sure, we will help you in booking a ticket. Can you please provide me your journey details?

USER: My source and destinations are NY-JFK, CA-SFO. And my departure day is 06/25, return day is 06/27.

ASSISTANT: OK, please wait for a while.

USER: OK sure.

ASSISTANT: Thank you for waiting. No flights are available on your scheduled dates.

USER: OK, thank you for your service.

ASSISTANT: Thank you for your approach, have a nice day.