You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Helen Smith.

ASSISTANT: How can I aid you?

USER: I have a plan to visit Oakland. Can you help me in booking flight ticket from ATL to OAK?

ASSISTANT: May I know your journey dates?

USER: My trip dates are Mar 9 to Mar 11.

ASSISTANT: How much can you afford for your ticket?

USER: I can afford up to 1000.

ASSISTANT: Do you have any connection limits?

USER: I need connecting flight.

ASSISTANT: Do you have any airline preference?

USER: I am comfortable with any airline.

ASSISTANT: Ok, please wait for a while.

USER: Ok.

ASSISTANT: Sorry, there is no flight available.

USER: Ok, no problem. I will choose alternate way to reach my destination. Thank you for giving information.

ASSISTANT: Thanks for reaching us.