You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: I am Patricia Young. I would like to book a flight ticket from OAK to LAX.

ASSISTANT: May I know your trip dates please?

USER: I am planning to start on 11/26 and return back on 11/28.

ASSISTANT: Sorry, there is no flight available as per your request.

USER: Ok, no problem. Thank you for the information.

ASSISTANT: Most welcome.