You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you?

USER: Could you please book a flight ticket from AUS to BOS?

ASSISTANT: Sure, may I know the travelling dates?

USER: My travelling dates are Apr 13 and Apr 15.

ASSISTANT: Do you have any connection limit?

USER: I need a single connecting flight.

ASSISTANT: Do you have any other requirements?

USER: No.

ASSISTANT: May I know your name?

USER: I am Thomas Smith.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Sorry, no flights found with your preferable dates.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for opting us.