You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: I am Jessica Rodriguez. I want to book a direct flight to Austin, can you help me?

ASSISTANT: May I know your desired travel dates please?

USER: My travel dates are 05/19 and 05/21.

ASSISTANT: Can I know your airport codes please?

USER: My airport codes are from LAX to AUS.

ASSISTANT: Please wait a while.

USER: Sure.

ASSISTANT: Sorry to say, there is no flight on your desired travel dates.

USER: No problem, thanks for checking.

ASSISTANT: Thank you for opting us. Have a nice day.