You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I aid you today?

USER: Please book me a ticket from AUS to PHL.

ASSISTANT: Sure. May I have your travelling dates?

USER: My travelling dates are from 12/15 to 12/17.

ASSISTANT: Ok. Do you have any preferences?

USER: I need a connecting flight.

ASSISTANT: May I have your name?

USER: I am James Lee.

ASSISTANT: No flights are found in search on respective dates. Thank you for choosing us.

USER: Fine, thanks for the information.