You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I am Charles White. I am planning to visit a new place at OAK. Can you please help me out to book a ticket for me?

ASSISTANT: Sure, may I know your planned dates to travel?

USER: I am planning to travel on 02/02 and return back on 02/04.

ASSISTANT: Can you please share your destination airport code?

USER: My nearest source code is JFK.

ASSISTANT: Sorry for the convenience, there is no flight available on your requested dates.

USER: That's fine.

ASSISTANT: Thank you for approaching us.

USER: Thank you for your service.