You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: Katherine Lewis here. I want to book a ticket from AUS to ORD. Could you help me?

ASSISTANT: Sure, kindly mention your travel dates.

USER: My preferable dates are from 02/15 to 02/17.

ASSISTANT: Ok, please wait a moment.

USER: Ok.

ASSISTANT: Sorry to inform, no flights found with your requirement.

USER: That's ok, no problem. Thank you.

ASSISTANT: Thanks for reaching us.