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

ASSISTANT: Hello, Paul Edwards. How can I amend you?

USER: I need to alter my reservation, as my meeting with my clients got postponed.

ASSISTANT: Ok.

USER: Could you help me in changing my existing reservation?

ASSISTANT: Sure, please hold for sometime, I will get back to you.

USER: Ok.

ASSISTANT: Thanks for waiting, but no reservation found on your name in the list.

USER: Ok, no worries.

ASSISTANT: Thanks for opting us, Have a cheerful day.

USER: Thanks for your service.