You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Scott Green.

ASSISTANT: How can I help you now?

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

ASSISTANT: Sure, provide me your travel dates please.

USER: My travelling dates are on Sept 21 and 23.

ASSISTANT: Do you have any connection limit?

USER: I need a single connection.

ASSISTANT: May I know about your class preference?

USER: I do not have any class.

ASSISTANT: Do you have any airline preference?

USER: No.

ASSISTANT: Let me know your depart and arrival timings.

USER: My return time is afternoon.

ASSISTANT: Ok, please wait for a minute.

USER: Sure.

ASSISTANT: Sorry, there are no flights available as per your specifications.

USER: Ok, not a problem. Thank you.

ASSISTANT: Thank you for contacting us.