You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, May I know your good name please?

USER: I am Richard White.

ASSISTANT: How can I aid you?

USER: Due to a lot of fog, I need to change my reservation.

ASSISTANT: Sure, I will help you with that. Please wait a moment.

USER: Sure.

ASSISTANT: Thank you for waiting. I have checked in reservation list to change your ticket, but could not find any reservation with your name.

USER: OK, no matters.

ASSISTANT: Thank you for availing us, Have a fantastic day.

USER: Thank you for helping me.