You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: My name is Gregory Johnson. Can you please help me in changing my existing reservation details?

ASSISTANT: Sure, I will help you. Please wait a while. There is a reservation on your name in our database.

USER: That's ok, thank you.

ASSISTANT: May I know your desired airport codes please?

USER: Sure, my airport code are from CLT to ATL.

ASSISTANT: Can I know your preferred travel dates please?

USER: My trip dates are from 09/13 to 09/15.

ASSISTANT: There is a flight with connection limit 1 and fare 100, is it ok for you?

USER: Ok, please proceed.

ASSISTANT: Ticket is booked, flight number 1002.

USER: Thank you.

ASSISTANT: Thank you for opting us.