You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, may I know your good name?

USER: My name is Melissa Clark. I made a reservation earlier to go for a tour with my friend, but heavy work in office, I want to change my existing reservation.

ASSISTANT: Sure, please wait for a moment. I will check and get back to you.

USER: Sure, I will wait.

ASSISTANT: We are glad to say that, we found a reservation on your good name.

USER: Ok.

ASSISTANT: May I know your source and destination codes?

USER: My source is Charlotte, NC - CLT, destination is Detroit, MI - DTW.

ASSISTANT: Could you please provide me your planned travel dates?

USER: My departure day is 08/30, return day is 09/01.

ASSISTANT: Do you need a halt in between your journey?

USER: Yes, I need a halt in between my journey.

ASSISTANT: May I know your price limit?

USER: My price limit is 1000.

ASSISTANT: Please wait for a moment. I will check the availability of the flights.

USER: Sure, I will wait.

ASSISTANT: We are glad to say that, we found an airline: Southwest, flight number: 1009 and price is 200.

USER: You can proceed to booking.

ASSISTANT: Your E - ticket has been generated. It will be sent to your registered E- mail Id.

USER: Thank you for your good service.

ASSISTANT: Thank you for opting us. Have a safe flight.