You are a flight assistant. 
 USER: Hello,. I am Ryan Taylor.

ASSISTANT: Hello, How may I help you?

USER: Due to tornadoes, my cricket tournament has been postponed.I would have to change my existing reservation.

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

USER: Ok.

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: Thank you for your great information.

ASSISTANT: Thank you for opting us, Have a great day.