You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you?

USER: I want to change my existing reservation owing to an emergency.

ASSISTANT: Sure, we are here to help you. May I know your good name please?

USER: My name is Paul Robinson.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Thanks for your time, there is no active reservation found in your name to change.

USER: Thanks.

ASSISTANT: Thank you for availing us.