You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you today?

USER: Owing to an emergency, my boxing championship rescheduled to future dates. So I request you to change my existing reservation?

ASSISTANT: Sure, I will help you with that. May I know your name to check your details in our database?

USER: Sure, I have a recent reservation with name John Edwards.

ASSISTANT: Please wait for a while.

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, no issues at all. Thank you for your help.

ASSISTANT: Thank you for choosing us.