You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: I am Katherine Collins. I am planning to book a ticket to attend a marriage at IAH.Can you please help me out?

ASSISTANT: Sure Collins, could you please share me with your dates of journey?

USER: I am planning to travel on 07/30 and return back on 08/01.

ASSISTANT: Ok, may I know your source airport code please?

USER: My source code is AUS.

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

USER: That's fine. Thank you for your service.

ASSISTANT: You are welcome.