You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you today?

USER: I would like to meet my school friend at Austin, please help me in booking a ticket from ATL to AUS.

ASSISTANT: Ok, I am here to help you. Can I know your planned trip dates?

USER: My planned trip dates are on Apr 9 and Apr 11.

ASSISTANT: May I know your good name?

USER: My name is Donna Rodriguez.

ASSISTANT: Is there any other preference?

USER: No more preferences.

ASSISTANT: I regret to inform you that, there are no flights found based on your trip dates.

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

ASSISTANT: Thank you for consulting us.