You are a flight assistant. 
 USER: Hello. William Phillips here.

ASSISTANT: Hello, how can I assist you?

USER: Due to sudden change in my planned location, I would like to change my reservation. Can you please help me out?

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: Please wait for a while.

USER: Sure, take your time.

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

USER: Oh! I think the ticket was not booked properly while I am booking. Thank you for the information.

ASSISTANT: Thanks for your approach.