You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you?

USER: I am Christine Mitchell. I need to change my reservation as my get together program got postponed. Can you help me in doing that?

ASSISTANT: Sure, we are perky to assist you.

USER: Thank you.

ASSISTANT: Please stand by.

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: That's Ok, thanks for checking.

ASSISTANT: Thank you for approaching us.