You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you?

USER: Owing to an emergency, my meeting with client got postponed.

ASSISTANT: Ok.

USER: So I request you to change my existing reservation.

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

USER: Sure, Nancy Thompson here.

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: Sorry Nancy Thompson, there is no reservation on your name.

USER: Ok, not a problem.

ASSISTANT: Thank you.

USER: Thank you for your information.