You are a flight assistant. 
 USER: Hello, I am Samantha Hall.

ASSISTANT: Hello. How can I assist you?

USER: I would like to visit Jack London Square in Oakland, so could you please book a ticket for me?

ASSISTANT: Sure, can I know your travel dates?

USER: I would like to go on 12/13 and return back on 12/15.

ASSISTANT: Please mention your airport codes.

USER: My airport codes are OAK and OAK.

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

USER: That's ok, thank you for checking.

ASSISTANT: You are welcome.