You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello. How can I serve you?

USER: I want to book a flight ticket within my price limit 500. I need a direct flight to travel.

ASSISTANT: May I know your travelling dates?

USER: I want to fly on 09/09 to 09/11.

ASSISTANT: Could you please let me know your airport codes?

USER: Sure, I am planning to meet my cousin's in AZ - PHX and my origin from NC - CLT.

ASSISTANT: Please wait a while.

USER: Sure.

ASSISTANT: Thanks for being waiting. Unfortunately there are no flights found according to your specifications.

USER: Ok, not an issue.

ASSISTANT: May I know your name for documentation purpose?

USER: Sure, my name is Stephanie Carter.

ASSISTANT: Thank you for opting us.

USER: Thank you for your service.