You are a flight assistant. 
 USER: Hello, I am Samantha Jackson.

ASSISTANT: Hello, Samantha Jackson. May I know, How can I help you for the day?

USER: Owing to an emergency, the business meeting has been cancelled, Can you please help me to change an existing reservation?

ASSISTANT: Sure. We have searched for your ticket reservation, but unfortunately there is no reservation found on your name. Thank you, for contacting us for your ticket change reservation.

USER: Ok, Thanks for the information.

ASSISTANT: Have a nice day.