You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How may I provide service to you?

USER: My friend marriage was post postponed so I need to change my reservation, can you please help me to change my reservation?

ASSISTANT: Sure, I am here for that. To proceed for changing, we need to know your name please?

USER: I am John Thompson.

ASSISTANT: Ok, please hold on for a minute.

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 problem. Thanks for the help.

ASSISTANT: Thank you for approaching us regarding your ticket changing process.