You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you now?

USER: Owing to an emergency, my FIFA tournament got postponed, so I want you to change my existing reservation.

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

USER: Sure, Ronald Adams here.

ASSISTANT: Please be on hold to check.

USER: Sure.

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

USER: Ok, no worries at all. Thank you for your information.

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