You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you?

USER: I am looking for a flight ticket with evening as the return time. So can you book it for me?

ASSISTANT: Sure, may I know your travel dates?

USER: The trip dates are from 05 Aug to 07 Aug.

ASSISTANT: Where you need to catch the flight and land?

USER: The airport codes are from BOS to AUS.

ASSISTANT: Do you need any way station in your journey?

USER: I prefer a stopover flight.

ASSISTANT: Do you have any other requirements?

USER: No.

ASSISTANT: For documentation, may I know your name please?

USER: I am Samuel Turner.

ASSISTANT: Sorry to inform you that, there are no flights available with your requirements.

USER: Not a problem. Thank you.

ASSISTANT: Thank you for choosing us.