You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: Please help me in booking flight ticket from PHL to AUS.

ASSISTANT: Sure, We are here to help you.

USER: Thank you.

ASSISTANT: Can I know your travelling dates?

USER: My trip dates are July 21 to July 23.

ASSISTANT: Do you need any break?

USER: I need a connecting flight.

ASSISTANT: May I know your name?

USER: Myself Elizabeth Turner.

ASSISTANT: Is there any other specifications?

USER: I prefer to travel in business class.

ASSISTANT: Give me  a minute.

USER: Sure.

ASSISTANT:  We are unable to provide flight in between your journey routes due to some technical up-gradation at destination airport.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for reaching us.