You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you out?

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

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

USER: Thank you. I have planned my travel  dates as Nov 16 and Nov 18.

ASSISTANT: Can I know your name please?

USER: Sure, myself Jeffrey Turner.

ASSISTANT: Do you need any specifications?

USER: I would like to depart in evening time so please make sure that.

ASSISTANT: Can I know your class preference?

USER: I would prefer economy class to travel.

ASSISTANT: Sorry, there are no flights found in our database.

USER: Oh! It is sad to hear. Anyway, thank you for your time.

ASSISTANT: Thank you for reaching us.

USER: Most welcome.