You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you today?

USER: I am Elizabeth Rodriguez. Can you help me booking a flight ticket from DEN to AUS?

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

USER: I will start on 01/18 and return on 01/20.

ASSISTANT: Wait for a minute.

USER: Sure.

ASSISTANT: We are great to inform you that, there are no flight's available based on your travelling  dates.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for consulting us.