You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hi. How can I help you?

USER: My name is Kevin Edwards. Suddenly a change in my plan.So I want to change my reservation.

ASSISTANT: Sure, just a second please.

USER: OK.

ASSISTANT: Mr Kevin Edwards, I cannot find any reservation on your name.

USER: OK, thanks for your help.

ASSISTANT: Thank you.