You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you today?

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

ASSISTANT: Sure, please share your name and let me check if I can help you with it.

USER: Sure, my name is David White.

ASSISTANT: Please stay connected for a while.

USER: Sure.

ASSISTANT: We are sorry to let you know that we didn't find any reservation on your name to make changes.

USER: Not an issue, thank you for your valuable information.

ASSISTANT: Thank you.