You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am Dennis Roberts. I planned for a vacation in AUS, can you help me to book a flight ticket from DEN?

ASSISTANT: Glad to meet you Roberts. May I know your travelling dates please?

USER: I would like to fly on 10/17 and return back on 10/19.

ASSISTANT: There are no flights with your requirements. Thank you for approaching us.

USER: That's ok. Thank you for your time.

ASSISTANT: Welcome.