You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I address you today?

USER: Can you please help me to change my reservation?

ASSISTANT: Sure, may I know your name please?

USER: Myself Christopher Gonzalez.

ASSISTANT: Thanks for providing your name, no reservation found with your name to change.

USER: Ok, no problem.

ASSISTANT: Thanks for approaching us.

USER: Thanks for your service.