You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you now?

USER: I am Deborah Lewis from Oakland. I need a direct flight to attend a client meeting in Charlotte, so please book a flight ticket from CA - OAK to NC - CLT.

ASSISTANT: Sure, please share me your planned journey dates?

USER: I will start on 11/20, return on 11/22.

ASSISTANT: May I know your budget for flight ticket?

USER: My budget is 200.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Thank you for waiting, sorry there is no flight available on your journey data.

USER: Not an issue, thank you.

ASSISTANT: Thank you for reaching us, we hope see you again.