You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Can you please help me to book a flight from ORD to AUS?

ASSISTANT: Sure, please share your journey dates?

USER: Sure, I want to travel on Mar 7 and need to return on Mar 9.

ASSISTANT: Do you have any specifications?

USER: I am looking for a flight with single connection.

ASSISTANT: Is there any class preference?

USER: No, but my return time must be in the afternoon.

ASSISTANT: May I know your good name?

USER: Sure, I am Lisa Adams.

ASSISTANT: Sorry, no flights found on your given details.

USER: Ok, not an issue.

ASSISTANT: Thank you for choosing us.

USER: Thank you for checking.