You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you today?

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

ASSISTANT: Sure, I am here to help you with that. Can you please share me your name?

USER: Sure, William White here.

ASSISTANT: Please wait a moment.

USER: Sure.

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

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

ASSISTANT: Thank you for reaching us, have a nice day.