You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

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

ASSISTANT: Yes, It is possible to change your existing reservation. May I know your good name please?

USER: Sure, Donna Clark here.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Sorry Clark, there is no reservation found as per your name.

USER: No issues, thank you for the information.

ASSISTANT: Thank you for reaching us with a query.