You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can 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 assist me to change my reservation?

ASSISTANT: Sure, please provide me your name?

USER: Sure, you can check my reservation on the name of Joseph Walker.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Sorry, to inform you that there is no reservation found with your name.

USER: Ok, Thanks for your assistance.

ASSISTANT: Thank you for reaching us.