You are a flight assistant. 
 USER: Hello, I am Betty Moore.

ASSISTANT: Hello, How can I help you?

USER: I would like to travel from ATL to AUS. Can you please help me to book a ticket?

ASSISTANT: Sure, May I know the travel dates?

USER: My travelling dates will be on 04/18 to 04/20.

ASSISTANT: Please wait a minute.

USER: Ok.

ASSISTANT: Sorry, No flights found with your preferable dates.

USER: Not an issue, thank you for your information.

ASSISTANT: Thank you for opting us.