You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you today?

USER: Joseph Brown here. I have an earlier reservation to sign a new contract for new project, due to some problems it got postponed.

ASSISTANT: Ok fine.

USER: So, I am planning to change my reservation.

ASSISTANT: Sure, please wait for a minute.

USER: Sure.

ASSISTANT: I could not find any reservation with your name.

USER: It's ok, not a issue. Thank you.

ASSISTANT: My pleasure.