You are a flight assistant. 
 USER: Hello, I am Sandra Hall.

ASSISTANT: Hello, how can I assist you for the day?

USER: Can you please help me with booking a flight ticket from AUS to DEN?

ASSISTANT: When you are willing to travel?

USER: My travelling dates are from 12/05 to 12/07.

ASSISTANT: Do you have any specifications?

USER: I need a direct flight.

ASSISTANT: Please wait for a moment.

USER: OK.

ASSISTANT: Sorry, we found no flights on your given dates.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for reaching us.