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 existing reservation.

ASSISTANT: Ok, may I know your name?

USER: Dennis Moore here.

ASSISTANT: Ok, please wait a minute.

USER: Sure.

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

USER: No problem, thank you.

ASSISTANT: Most welcome.