You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Linda Brown.

ASSISTANT: How may I help you?

USER: I am looking for a flight from AUS to BOS, can you please help me in booking?

ASSISTANT: Sure, I will help you in booking the ticket. May I know your travelling dates please?

USER: My travelling dates are Oct 19 and Oct 21.

ASSISTANT: Do you have any other specifications?

USER: My return time is afternoon.

ASSISTANT: Sorry for this inconvenience, I could not find any flight with your requirements.

USER: That's ok, thank you for checking.