You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, what help are you looking for?

USER: Myself Christopher Green. For some personal issues I want to change my locations, can you please help me in changing my reservation?

ASSISTANT: Sure, please wait for a moment. Sorry, there is no reservation found on your name to change the existing reservation.

USER: It's ok. Thank you for the information.

ASSISTANT: Most welcome. Have a great day.