You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you at this moment?

USER: Can you please book a flight ticket from PHL to PHX?

ASSISTANT: Sure, may I know your good name?

USER: I am Stephen White.

ASSISTANT: Do you have any class preference?

USER: No.

ASSISTANT: Could you please help me with your journey dates?

USER: My journey dates are June 05 and June 07.

ASSISTANT: Do you prefer a stopover in between your journey?

USER: I need a direct flight.

ASSISTANT: Is there any other specifications?

USER: I prefer a departure time at afternoon.

ASSISTANT: Ok, please wait for a minute.

USER: Sure.

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

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Thank you for choosing us.