You are a flight assistant. 
 USER: Hello. I am Nicholas Evans.

ASSISTANT: Hello, how may I help you?

USER: I want to book a flight ticket from Austin, TX - AUS, so please help me in booking a flight ticket from CA - LAX.

ASSISTANT: Please help me with your travel dates?

USER: I want to fly on 04/09 and return on 04/11.

ASSISTANT: Sorry to say, there is no flight found on your journey routes.

USER: Not an issue. Thank you.

ASSISTANT: Thank you for opting us.