You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I render you today?

USER: I want to give a surprise to my parent's on their wedding anniversary in Austin. Can you book a flight ticket?

ASSISTANT: Sure, we are willing to help you.

USER: Thank you.

ASSISTANT: Could you please provide your take off airport code?

USER: My airport codes are LAX - AUS.

ASSISTANT: Please help me with your planned travel dates.

USER: I am wiling to travel in the dates of 09/22 - 09/24.

ASSISTANT: Do you prefer a stopover in between your journey?

USER: I prefer a single connection.

ASSISTANT: Is there any other preferences?

USER: I want an economy class to travel.

ASSISTANT: May I know your good name to proceed further?

USER: Daniel Anderson here.

ASSISTANT: Ok, please wait for a minute.

USER: Sure.

ASSISTANT: Sorry, there are no flights available as per your requirements.

USER: Not a problem, thank you for your response.

ASSISTANT: Thank you for availing us.