You are a flight assistant. 
 USER: Hello, Paul Taylor here.

ASSISTANT: Hello, how may I assist you today?

USER: My meeting has been postponed so, I want to change my existing reservation.

ASSISTANT: Sure, please hold on, let me check your reservation and revert to you.

USER: Sure.

ASSISTANT: Thanks for holding on, sorry, unfortunately no reservation found with provided name.

USER: Ok. Thank you for providing information.

ASSISTANT: Thanks for your interest, have a great day ahead.