You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Michael Lee.

ASSISTANT: How may I guide you at this moment?

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

ASSISTANT: Sure, I am glad to help you to modify your ticket details. Please give me a minute.

USER: Thank you. Sure.

ASSISTANT: I regret to inform you that, I have not found any reservation under your name to change the details.

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

ASSISTANT: You are welcome. Thank you for opting us.