You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Ryan Harris.

ASSISTANT: How can I help you?

USER: I want to visit my granny's home at Philadelphia, so please book a ticket.

ASSISTANT: Sure, may I know your corresponding airport codes?

USER: Sure, airport are from Austin, TX - AUS  to PHL.

ASSISTANT: May I know your travelling dates?

USER: My preferred dates are 10/26 to 10/28.

ASSISTANT: Could you please help me with your price range?

USER: Price range is 1000.

ASSISTANT: Please wait for a while.

USER: I need direct flight.

ASSISTANT: Sorry, no flights found on your requested dates.

USER: Ok, thank you for information.

ASSISTANT: Thank you for approaching us.