You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: Can you help me to book a flight ticket from ORD to AUS?

ASSISTANT: Sure, can you please mention your dates of journey?

USER: My travel dates are 05 to 07 of June.

ASSISTANT: May I know your name please?

USER: I am Brian Parker.

ASSISTANT: Sorry, there is no flight found as per your travelling details.

USER: It's ok, not a problem. Thank you.

ASSISTANT: You are welcome.