You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you for today?

USER: I am John Miller. I would like to change my reservation as I am leaving for hometown, can you please help me out?

ASSISTANT: I am here to help you about that.

USER: Thank you.

ASSISTANT: Sorry Miller, there is no active reservations under your name.

USER: Ok no problem, thank you for your services.

ASSISTANT: Most welcome, thank you for reaching out here.