You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I aid you?

USER: Please change my existing reservation.

ASSISTANT: Sure, may I know your name to check your details in our database?

USER: Sure, I am Michael Baker.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Sorry to inform you that there is no active reservation on the name Michael Baker.

USER: Ok, thanks for the information.

ASSISTANT: Thank you for reaching us.

USER: Thank you.