You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I assist you today?

USER: Due to relocation of my fashion show competition, I need to change my existing reservation.

ASSISTANT: Sure, I will help you with that. Let me know your name to check your reservation?

USER: Sure, I am Samuel Nelson.

ASSISTANT: Ok, 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, Thank you.

ASSISTANT: Thank you for reaching us.