You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: I am Elizabeth Evans. I heard that Austin is a best place for site seeing, Can you please book a ticket to AUS?

ASSISTANT: Sure, may I know your depart date and arrival date?

USER: Journey dates are 05/05 to 05/07.

ASSISTANT: Can you please provide your source airport code?

USER: Origin code is Las Vegas, LAS.

ASSISTANT: Do you need a halt in between your journey?

USER: I need direct flight.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Sorry, there is no direct flight from your source.

USER: No problem. Thank you.

ASSISTANT: Thank you for choosing us.