You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I aid you today?

USER: Owing to an emergency, my meeting with client got postponed, so I want you to change my existing reservation.

ASSISTANT: Sure, I will help you with that. May I know your name please?

USER: Sure, Paul Lewis here.

ASSISTANT: Please wait for a moment, let me check your previous reservation status.

USER: Sure.

ASSISTANT: Thank you for waiting. There is no active reservation found on your name in our database to change it.

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

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