You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you today?

USER: I want to change my reservation due to sudden work. Can you please change my reservation?

ASSISTANT: Sure, please provide your good name?

USER: Matthew Wilson here.

ASSISTANT: Please hold a moment.

USER: Ok.

ASSISTANT: Thank you for your time, there is no active reservation found on the given name.

USER: Ok, not an issue. Thank you.

ASSISTANT: Thank you.