You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you today?

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

ASSISTANT: Sure, may I know your name?

USER: Sure, Paul Martinez here.

ASSISTANT: Sorry, there is no active reservation your name. Thank you.

USER: Ok, no issues.

ASSISTANT: Thank you.

USER: Thank you for your information.