You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am Brian Wright. Can you please help me in booking a flight ticket from LAX to AUS?

ASSISTANT: Sure, I will help you to book a flight ticket. Can you please share me your travelling dates?

USER: I would like to fly on Mar 28 and return on Mar 30.

ASSISTANT: Please give me a moment.

USER: Make sure that, my depart time is afternoon and arrival time is evening.

ASSISTANT: Sorry, no flights are available on your route.

USER: Not an issue. Thank you for your information.

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