You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you today?

USER: Could you please book a flight ticket from AUS to PHL?

ASSISTANT: Sure, may I know your planning dates?

USER: I have planned to travel on June 01 and return on June 03.

ASSISTANT: Do you have any specifications?

USER: I need a single connecting flight. And I want to depart in the evening.

ASSISTANT: May I know your good name?

USER: My name is Rachel White.

ASSISTANT: Sorry, no flights are available in this route as per your requested dates.

USER: Not a problem, thank you.

ASSISTANT: Thank you for reaching us.