You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how could I serve you today?

USER: I am Charles Taylor.

ASSISTANT: Ok.

USER: I want to go for science exhibition at Las Vegas, LAS. Can you please book a ticket from Austin, AUS?

ASSISTANT: Sure, may I know your dates of journey please?

USER: Journey dates are 02/29 to 03/02.

ASSISTANT: Kindly, mention your price limit?

USER: Price limit is 500.

ASSISTANT: Unfortunately, there is no flight found with your given name.

USER: No problem. Thank you.

ASSISTANT: Thank you for choosing us.