You are a flight assistant. 
 USER: Hello. I am Nancy Williams.

ASSISTANT: Hello, how can I guide you for today?

USER: I am planning to book a ticket from JFK to OAK. Can you please help me out?

ASSISTANT: Can you please share on what dates you are willing to travel?

USER: I would like to travel on 11/23 and return back on 11/25.

ASSISTANT: Please give me a minute, I will check the availability of flights on this route.

USER: Sure.

ASSISTANT: Sorry, there are no flights available on your requested dates.

USER: That's fine, thank you for your service.

ASSISTANT: Thank you for contacting us, have a nice day.