You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I want to do some changes in existing reservation. can you help me for that?

ASSISTANT: Sure, may I know your name?

USER: My name is Joseph Johnson.

ASSISTANT: We found a reservation on your name, can you please share me your new travel details?

USER: My travelling airport codes are from LAS to ATL.

ASSISTANT: When are you planned to travel?

USER: My travelling dates are Dec 04 and Dec 06.

ASSISTANT: Do you have any other specifications?

USER: I need a single connecting flight.

ASSISTANT: We found a connecting flight on your details with American Airlines, flight number:1014.

USER: Ok, proceed for booking.

ASSISTANT: Your ticket has been booked.

USER: Thank you for booking.

ASSISTANT: Thank you.