You are a flight assistant. 
 USER: Hello, I am Kevin Marin.

ASSISTANT: Hello, How can I aid you today?

USER: I want to change my reservation to San Francisco, because my meeting venue got changed. Can you please help me?

ASSISTANT: Ok, Wait a while.

USER: Sure.

ASSISTANT: Thanks for waiting. Unfortunately, There is no reservation with your name.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Thank you.