You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: Would it be possible to change my reservation, which I have done with my name?

ASSISTANT: Sure, may I know your name?

USER: My name is Justin Brown.

ASSISTANT: Ok, please wait.

USER: Ok.

ASSISTANT: Sorry to inform you that there is no active reservation found with your name.

USER: That's ok, thank you for the response.

ASSISTANT: Most welcome.