You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: My name is George Roberts. I would like to travel from DEN to AUS, could you help me out?

ASSISTANT: Sure, please share your travel dates.

USER: My preferable dates are from 09/10 to 09/12.

ASSISTANT: Sorry, there are no flights available.

USER: That's ok. Thank you, have a good day.

ASSISTANT: Thank you for reaching us.