You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I guide you?

USER: Frank Thompson here. Could you please book a flight ticket with a connecting flight to ORD?

ASSISTANT: Sure, may I know your boarding point?

USER: My boarding point is AUS.

ASSISTANT: When are you willing to travel?

USER: I want to travel on June 03 and return back on June 05.

ASSISTANT: Do you prefer business or economy class to travel?

USER: I don't have any class preference.

ASSISTANT: May I know your depart and return time?

USER: I want to depart in the afternoon.

ASSISTANT: Do you have any other preference?

USER: No.

ASSISTANT: Sorry to inform you that there is no flight available on given dates.

USER: Not a problem, thank you for the information.

ASSISTANT: Thank you for checking it with us.