You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I provide service to you?

USER: Can you please assist me in booking a flight ticket to PHX from DTW?

ASSISTANT: Sure, do you need a connecting or direct flight?

USER: I need a direct flight.

ASSISTANT: Could you please provide your preferred dates of travel?

USER: My preferred travel dates are from Sept 18 to Sept 20.

ASSISTANT: May I know your good name?

USER: I am Pamela Young.

ASSISTANT: Is there any other specifications?

USER: No.

ASSISTANT: Sorry to say this, there are no flights available as per your request.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for opting us.