You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you today?

USER: Can you please assist me for booking from EWR to PHX?

ASSISTANT: Sure, I am happy to help you. May I know your travel dates please?

USER: My trip dates are on Aug 17 and 19.

ASSISTANT: Ok, do you have any specifications?

USER: I prefer to travel in an economy class.

ASSISTANT: Ok, hold on for a moment. Let me check the best available flight for you.

USER: Sure.

ASSISTANT: May I know your name please?

USER: Joseph Martinez here.

ASSISTANT: Sorry Joseph Martinez, there are no flights available on your requested dates.

USER: Ok, thanks for your response.

ASSISTANT: Welcome, thank you for choosing us. Have a great day.