You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Carolyn King.

ASSISTANT: How can I aid you?

USER: I want to attend for my niece's marriage in Austin, so please book a flight ticket from DEN to AUS.

ASSISTANT: Sure, can I know the travel dates are please?

USER: My journey dates are Sep 11 to Sep 13.

ASSISTANT: Do you have any requirements?

USER: I need a connecting flight which return in morning.

ASSISTANT: Ok, wait a moment please.

USER: Sure.

ASSISTANT: Sorry, there are no flights available as per your request.

USER: No issue, thank you.

ASSISTANT: Thank you for approaching us.