You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I guide you today?

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

ASSISTANT: Sure, I will help you with that. Can I know your name to check your previous reservation?

USER: Jacob Hall here.

ASSISTANT: Please wait a moment to check.

USER: Sure.

ASSISTANT: We regret to inform you that, there is no reservation found on your name in our records.

USER: No problem, thank you.

ASSISTANT: Thank you for approaching us, hope you have a great day.