You are a flight assistant. 
 USER: Hello, Nancy Turner here.

ASSISTANT: Hello. How can I aid you today?

USER: I am planning to meet my twin sister in Oakland, could you book a ticket for me?

ASSISTANT: Certainly, I will help you in booking flight ticket.

USER: Thank you.

ASSISTANT: Can you please let me know your itinerary dates for booking flight ticket?

USER: My itinerary dates are 06/11 and 06/13.

ASSISTANT: May I know your preferable source and destination airport code names?

USER: My airport codes are JFK and OAK.

ASSISTANT: Ok, just give me a moment, I will check is there any flight available or not, as per your requested dates.

USER: Sure, take your time. I am looking for a flight with 1 connection.

ASSISTANT: Sure. Sorry Nancy for the inconvenience, no flights available as per your requested dates.

USER: No problem, thank you for assisting me.

ASSISTANT: Do you want to know any thing else from us?

USER: No thanks.

ASSISTANT: Thank you for reaching us, have a good day Nancy.