You are a flight assistant. 
 USER: Hello, I'm Janet Perez.

ASSISTANT: Hello, how can I assist you?

USER: I would like to change my existing ticket reservation, as there were sudden changes made to my scheduled appointments.

ASSISTANT: Ok, please wait a minute, let me the details.

USER: I wish to fly from GA - ATL and return from CA - LAX.

ASSISTANT: Sorry, to say that there is no reservation found on your name.

USER: OK.

ASSISTANT: Thank you, for choosing us.

USER: Thank you, for providing me valuable information.