You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I want to change my existing reservation. Could you help me with that?

ASSISTANT: Sure, may I know you name to check for the previous reservation?

USER: Stephanie Brown here.

ASSISTANT: I found your reservation. Can you please share your travel dates?

USER: My travelling dates are from Apr 21-23.

ASSISTANT: Could you please help me with the airport codes?

USER: My source and destination airport codes are from MCO to IAD.

ASSISTANT: Do you have airline preference?

USER: No.

ASSISTANT: May I know your connection limit?

USER: I prefer for single connection flight.

ASSISTANT: Do you have any other specification that you are looking for?

USER: No.

ASSISTANT: Stephanie Brown, there is a flight available with price 100 and the connection is 1 with AA airline. Would you like me to proceed with the booking?

USER: Yes, please proceed.

ASSISTANT: Your booking is confirmed with 1018 flight number and the departure time is 21:00 and the return time is 13:00.

USER: Thank you.

ASSISTANT: Thank you for reaching us.