You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Help me to find a direct flight from Charlotte for vacation to Phoenix.

ASSISTANT: Sure. May I know your name?

USER: My name is Sarah Martinez.

ASSISTANT: When do you want to travel for your vacation?

USER: I like to fly on 06/02 and return on 06/04.

ASSISTANT: Can you share the airport codes of the journey?

USER: Sure, I need a flight from airport NC-CLT to airport AZ-PHX.

ASSISTANT: Unfortunately, there is no flight found according to your requirement.

USER: Ok.

ASSISTANT: Sorry for the trouble.

USER: Thank you for helping me.

ASSISTANT: Thanks for contacting us.