You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you now?

USER: Can you help me in booking a flight ticket from AUS to SFO?

ASSISTANT: Sure, please share me your planned journey dates?

USER: I want to travel on 06/18, and return on 06/20.

ASSISTANT: Do you want direct or connecting flight?

USER: I need a connecting flight.

ASSISTANT: Please mention your class preference?

USER: I am comfortable with any class.

ASSISTANT: Do you have any other requirement?

USER: No.

ASSISTANT: May I know you name please?

USER: I am Karen Hall.

ASSISTANT: Thank you for your name, sorry there is no flight available on your given journey data.

USER: Ok, no issues. Thanks for the information.

ASSISTANT: Thank you for visiting us, have a nice day ahead.