You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How exactly I can serve you the best today?

USER: Jonathan Anderson, I need to change my recent reservation.

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

USER: Sure, I will wait here for you.

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: It's ok, thank you for the information.

ASSISTANT: Thank you for choosing us.