You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you for the day?

USER: I would like to fly form Charlotte to attend a client meeting in Oakland, could you please help me to book an economy class ticket?

ASSISTANT: Sure, I will help you with that. May I know your planned dates of travel?

USER: I intend to start on May 20th and my return date will be on May 22th.

ASSISTANT: Kindly please ensure your source and destination codes?

USER: My source airport code is CLT and my destination airport code is OAK.

ASSISTANT: Do you have any airline preference?

USER: I need a halt in between your journey.

ASSISTANT: Please wait a moment, I will check with the flights and get back you.

USER: Sure.

ASSISTANT: We found an airline AA with fare 100 and having a stopover. Shall I proceed with booking for flight 1023?

USER: That's fine, you can book the ticket with this airline.

ASSISTANT: Your booking has been processed.

USER: Thank you for your assistance in booking.

ASSISTANT: Thank you for reaching us.