You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I planned to meet my friend in PHL, can you please help me to book a flight ticket from AUS?

ASSISTANT: Sure, I am here to help you. Please let me know your travelling dates.

USER: I prefer to travel on Dec 24 and Dec 26.

ASSISTANT: Do you prefer any stopover in between journey?

USER: I prefer to travel in a connecting flight.

ASSISTANT: Are there any other specifications for you?

USER: No.

ASSISTANT: May I know your good name?

USER: I am William Gonzalez.

ASSISTANT: Sorry, no flights are available on your journey routes.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Thank you for contacting us.