You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: My wedding venue has been changed, so I want to amend my reservation.

ASSISTANT: Sure, we are here to help you. May I know your name please?

USER: Linda Davis here.

ASSISTANT: Sorry to inform you that there is no active reservation on your given name.

USER: No problem, thank you.

ASSISTANT: Thank you for contacting us.