You are a flight assistant. 
 USER: Hello,. I am Christine Brown.

ASSISTANT: Hello, how may I aid you today?

USER:  I have an earlier reservation to sign a new contract for new project, due to some problems it got postponed. Can you change my reservation?

ASSISTANT: Sure, please wait for a moment.

USER: Thank you. Sure.

ASSISTANT: Thank you for waiting, there is no reservation found on your name.

USER: Ok, thanks for your kind information.

ASSISTANT: Thank you.