You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I  help you?

USER: Charles Smith here. I want to attend a Seminar in Oakland. Can you please help me for booking the flight ticket?

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

USER: My airport codes are AUS and OAK.

ASSISTANT: Your travelling dates please?

USER: My travelling dates are 06/01 and 06/03.

ASSISTANT: Do you have any specifications?

USER: I want to return on evening. I need single connecting flight.

ASSISTANT: I am sorry no flights found on your route.

USER: Anyway, thanks for the information.

ASSISTANT: Thank you for choosing us.