You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. Is there any help that you expect from my end?

USER: Can you please help me in changing my existing reservation?

ASSISTANT: Sure, I can help you. May I know your name for checking purpose?

USER: My previous reservation has done with the name Samantha Johnson.

ASSISTANT: I have found your reservation, can I know your airport codes?

USER: My airport codes of journey are ORD and LAS.

ASSISTANT: Can I know your new planned journey dates?

USER: My preferable journey dates are Apr 13 and Apr 15.

ASSISTANT: Please provide your connection preference.

USER: I prefer connecting flight for this trip.

ASSISTANT: As per your intent, there is a flight in American airlines which is providing you a flight to your destination with a ticket fare of 200, can I confirm your flight ticket booking?

USER: Please book my ticket in this flight.

ASSISTANT: I have confirmed your flight ticket booking in the above flight which is an economy class.

USER: Thank you for booking my ticket.

ASSISTANT: You are welcome and thank you for opting us.