You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: Please book a ticket from AUS to DEN to meet my sister.

ASSISTANT: Sure, we are glad to help you. Please let me know your travelling dates.

USER: My travelling dates are Feb 14 and Feb 16.

ASSISTANT: Do you have any break in between journey?

USER: I want a direct flight.

ASSISTANT: Is there any other specifications for you?

USER: I prefer economy class.

ASSISTANT: May I know your good name?

USER: I am John Miller.

ASSISTANT: Sorry, no flights are available on your journey routes.

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you for contacting us.