You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Kevin Parker here.

ASSISTANT: How may I assist you today?

USER: I would like to change my reservation, can you please help me out?

ASSISTANT: Please wait a moment.

USER: Sure.

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

USER: Ok, no problem. Thank you for checking out.

ASSISTANT: Thank you for approaching us.