You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: I am planning to visit my childhood friend who stays in Austin. Can you help me to book a flight ticket?

ASSISTANT: Sure, may I know when you are planning to travel?

USER: My trip dates are July 23 and 25.

ASSISTANT: Can you please share me your airport codes?

USER: My airport codes are PHL and AUS.

ASSISTANT: Do you have any other requirements?

USER: I need a connecting flight.

ASSISTANT: Can I know your name?

USER: Sure, Samantha Baker here.

ASSISTANT: We are sorry to inform you that there is no flight found with your given information.

USER: Ok, thank you.

ASSISTANT: Thank you.