You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello.

USER: I am Catherine Martin.

ASSISTANT: How can I serve 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 change my existing reservation?

ASSISTANT: Sure,I can help you out.

USER: Thank you.

ASSISTANT: Please wait a while.

USER: Sure.

ASSISTANT: Thanks for being waiting. We didn't found any reservation by this name.

USER: Ok, no issue. Thank you.

ASSISTANT: Thank you for choosing us.