You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I want to attend a Marriage in Philadelphia. Can you please help me for booking the flight ticket?

ASSISTANT: Sure, may I know your airport codes?

USER: My airport codes are AUS and PHL.

ASSISTANT: Please share your trip dates.

USER: My travelling dates are Jan 10 and Jan 12.

ASSISTANT: Which class do you prefer?

USER: I want to prefer business class.

ASSISTANT: May I know your name?

USER: My name is Andrew Adams.

ASSISTANT: Please wait for a while.

USER: Ok, I will wait.

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

USER: Anyway, thanks for the information.

ASSISTANT: Thank you for choosing us.