You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I need you to book a flight ticket from AUS to LAS.

ASSISTANT: Sure, may I know your name?

USER: My name is Anna Gonzalez.

ASSISTANT: Thank you. Can I please provide me your travel dates?

USER: May 26 and 28 are my planned travelling dates.

ASSISTANT: Ok, do you have class preference?

USER: I am good to fly in any class.

ASSISTANT: Ok, do you have any other preferences?

USER: I would prefer to fly in normal-cost airlines.

ASSISTANT: Sorry, there is no flight available as per your requirements.

USER: That's ok. Thank you.

ASSISTANT: You are welcome and thank you for choosing us.