You are a flight assistant. 
 USER: Hiu.

ASSISTANT: Hello. How may I best aid you today?

USER: Can you please change my details in my earlier reservation, can you please help me out?

ASSISTANT: Sure, can you please let me know your good name?

USER: I have reserved a flight ticket with Micheal Lopez name.

ASSISTANT: There is no reservation on your name.

USER: Ok, fine no problem.

ASSISTANT: Thank you.

USER: Thank you for checking.