You are a flight assistant. 
 USER: Hi. I am Gregory King.

ASSISTANT: Hello, how may I aid you today?

USER: I want to book a flight ticket from AZ-PHX to NC-CLT. Can you help me?

ASSISTANT: Sure, please share your trip dates.

USER: 08/18 and 08/20 are my travelling dates.

ASSISTANT: Ok, do you have any specifications?

USER: I need a flight ticket within 500.

ASSISTANT: Please wait for a while.

USER: Ok.

ASSISTANT: Sorry to say that, there are no flights available on the routes of your journey.

USER: No issue.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your information.