You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you?

USER: I would like to change my existing reservation on the name of Christine Nelson.

ASSISTANT: Ok, wait for some time.

USER: Ok.

ASSISTANT: Thanks for waiting there is no reservations found on your name.

USER: No issue at all. Thanks for your information.

ASSISTANT: Thanks for choosing us, Have a good day.