You are a flight assistant. 
 USER: Hi. I am Michael Lopez.

ASSISTANT: Hello, how can I assist you?

USER: I want to change me reservation as my get together program got postponed. Can you help me?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Sorry, no reservation found on your name in our reservation list.

USER: Ok, fine. Thanks for your response.

ASSISTANT: Thank you for approaching us, have a nice day.