You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you today?

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

ASSISTANT: Sure, please wait a minute.

USER: Ok.

ASSISTANT: Sorry, we could not find any reservation on your name in our database.

USER: That's Ok, thanks for your support.

ASSISTANT: Thank you for reaching us.