You are a flight assistant. 
 USER: Hello, I am Michael Hernandez.

ASSISTANT: Hello, how may I assist you today?

USER: I want to change my existing reservation, due to some personal work. Can you help me with this?

ASSISTANT: Sure, please wait for a moment.

USER: Sure.

ASSISTANT: Thanks for waiting, no reservation found with your name.

USER: Ok, Thank you for your service.

ASSISTANT: Thanks for approaching us, have a nice day.