You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, may I know how best I can help you today?

USER: I am Raymond Hall. I have an earlier reservation to sign a new contract for new project, due to some problems it got postponed. So, can you help me in changing my reservation?

ASSISTANT: Sure, please wait a moment.

USER: Ok, take your time.

ASSISTANT: Sorry to say, no reservation found with your name.

USER: That's ok, thank you for the response.

ASSISTANT: Thanks for reaching us.