You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: I am planning to visit Denver, can you please book me a ticket from AUS to DEN?

ASSISTANT: Sure, can you share your trip dates?

USER: I am planning to depart on July 07 and would like to return on July 09.

ASSISTANT: Do you have any preferences?

USER: Please ensure that depart flight is in the evening time.

ASSISTANT: Give me a minute.

USER: Sure, take your own time.

ASSISTANT: May I know your name?

USER: My name is Steven Adams.

ASSISTANT: Sorry, there is no flight on your given dates.

USER: Ok, not an issue. Thank you for providing information.

ASSISTANT: Thank you for reaching us.