You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

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: Myself Shirley Baker.

ASSISTANT: Sorry, there is no active reservation found on your name.

USER: Not an issue. Thank you.

ASSISTANT: Thank you for reaching us.