You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Please change my active reservation as my meeting was changed.

ASSISTANT: Sure, I will help you with that. May I know your name please?

USER: Donna Walker.

ASSISTANT: Please wait for a minute.

USER: Ok.

ASSISTANT: I am sorry to say that there is no flight found under your name.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for reaching us.