You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

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

ASSISTANT: Sure. Tell me your name please?

USER: My name is Michael Campbell.

ASSISTANT: Please wait.

USER: Sure.

ASSISTANT: Thanks for waiting. But I am sorry to say that there is no flight reservation on your name to change it.

USER: Ok, not a problem. Thank you.

ASSISTANT: Thank you.