You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I aid you?

USER: Would it be possible to change my reservation?

ASSISTANT: Sure, We are here to help you. May I know your name?

USER: Ok, I am Ruth White.

ASSISTANT: Please wait a while.

USER: Sure.

ASSISTANT:  Thank you for waiting, but I am sorry to say that, there is no active reservation found with your name in our database to change it.

USER: It's ok, thanks for checking.

ASSISTANT: Thank you for reaching us.