You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, what help can I do for you?

USER: I would like to change in reservation because my office has moved me to different location.

ASSISTANT: Ok, may I know your name please?

USER: My name is Samuel Green.

ASSISTANT: Sorry Samuel, there is no previous reservation found on your name to change.

USER: No issues, thanks for checking.

ASSISTANT: Thank you for contacting us. Have a great day.