You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Debra Turner.

ASSISTANT: How may I help you today?

USER: I am planning on travelling to DEN to meet my cousin, can you please help me to book a flight ticket from AUS?

ASSISTANT: Sure, I am here to help you with that. Can I have your journey dates?

USER: My trip dates are Mar 9 to Mar 11.

ASSISTANT: Do you have any other specifications?

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

ASSISTANT: Ok, may I know your class preference?

USER: I am ok in any class.

ASSISTANT: Ok, please wait for a minute.

USER: Sure.

ASSISTANT: Sorry to say that, there are no flight's available based on your travelling dates.

USER: No issue, thank you.

ASSISTANT: Thank you for reaching us.