You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you today?

USER: Owing to an emergency, my meeting with client to postponed. So I request you to change my existing reservation.

ASSISTANT: Sure, may I know your good name?

USER: Sure, Rachel King.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Sorry to say that, no reservation was found with your good name.

USER: Ok, no issues. Thank you for your assistance.

ASSISTANT: Thank you for reaching us.