You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Ashley Clark here. I am a movie director, I have to shoot climax scenes in Los Angeles. So please book my ticket from Chicago.

ASSISTANT: Sure, I am gleeful to help you. Could you please provide your travelling dates to search for the flight?

USER: My itinerary dates are 08/15 and 08/17.

ASSISTANT: May I know your airport codes?

USER: My genesis and terminus airport codes are ORD and LAX.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Sorry to say, no flight is available for you as per your requests.

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

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