You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I have an earlier reservation to sign a new contract for new project, due to some problems it got postponed. Can you please help me in changing my reservation.

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: Can I know your name?

USER: Myself Larry Williams.

ASSISTANT: Please wait.

USER: Ok.

ASSISTANT: Sorry Larry, there is no active reservation found with your name in our records.

USER: It's ok, thank you.

ASSISTANT: Most welcome.