You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: I want to book a ticket from LAS to AUS. Could you book a ticket?

ASSISTANT: Sure, may I know your trip dates please?

USER: Departure is Mar, 20 and return date is Mar, 22.

ASSISTANT: Ok, do you have any other requirements?

USER: I prefer to fly in a normal-cost airline.

ASSISTANT: Well, can I know your name please?

USER: I am Carolyn Garcia.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Sorry, we regret to inform you that there is no flight available as per your request.

USER: Thank you.

ASSISTANT: My pleasure.