You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you now?

USER: I would like to meet my sister at Chicago, please help me in booking a ticket from AUS to ORD.

ASSISTANT: Ok, may I know your journey dates for this journey?

USER: My planned journey dates are on May 7 and May 9.

ASSISTANT: Ok, may I know your connection preference?

USER: I need a direct flight.

ASSISTANT: Do you need any other specifications?

USER: No more specifications.

ASSISTANT: Meanwhile, may I know your good name?

USER: My name is Benjamin Miller.

ASSISTANT: I am very apologetic to inform you this news, but there is no flight available for your journey.

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

ASSISTANT: Benjamin Miller, thank you for choosing our services. Have a nice day ahead.