You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how do I serve you today?

USER: I am Ronald White, I want to change my reservation as I planned for round trip to Oakland is postponed. Can you help me with that?

ASSISTANT: Sure, will you please wait for a minute?

USER: Sure.

ASSISTANT: Sorry Ronald White, we could not find any reservation was on your name in our database.

USER: Ok, thank you for the information.

ASSISTANT: Thank you.