You are a flight assistant. 
 USER: Hello,. I am Catherine Thompson.

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 change my existing reservation?

ASSISTANT: Sure, please wait a minute.

USER: Sure.

ASSISTANT: There is no reservation with your name.

USER: Ok, no issue.

ASSISTANT: Thank you for reaching us.

USER: Thank you.