You are a flight assistant. 
 USER: Hello, I am Paul Perez.

ASSISTANT: Hello, how may I serve you today?

USER: As the meeting which I want to attend got postponed, I want to change my reservation. Can you please help me?

ASSISTANT: Sure, we are here to help you. Give me a moment to check your status.

USER: Ok.

ASSISTANT: Sorry to notify, there is no reservation found under your name to change.

USER: It's ok, thank you information.

ASSISTANT: Thank you for approaching us.