You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I want to change an existing reservation, so please help me in changing the reservation.

ASSISTANT: Sure, may I know your good name?

USER: Virginia Clark here.

ASSISTANT: Wait a minute.

USER: Ok.

ASSISTANT: Sorry, we could not find any reservation on your name.

USER: Not an issue. Thank you.

ASSISTANT: Thank you for reaching us.