You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: Can you help me to book a flight ticket from AUS to LGA?

ASSISTANT: Sure, may I know the travelling dates?

USER: My trip dates are Nov, 13 and Nov, 15.

ASSISTANT:  Are there any other specifications?

USER: No, thank you.

ASSISTANT: May I know your name?

USER: Stephen Hill here.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Sorry, No flights found with your chosen dates.

USER: Not a problem, thank you for the information.

ASSISTANT: Thank you for availing us.