You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I assist you?

USER: Can you please change my existing reservation, due to change of my trip plan to another location?

ASSISTANT: Sure, May I know your name?

USER: Please check the previous reservation status with the name of Christine Brown.

ASSISTANT: Please wait a second.

USER: Sure.

ASSISTANT: Sorry, No reservation found on your name.

USER: Ok, not an issue. Thank you.

ASSISTANT: Thank you for opting us.