You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I serve you?

USER: I want to change my reservation as my plan to meet my friend at Charlotte is postponed. Can you help me with that?

ASSISTANT: Sure. May I know your name please?

USER: My name is Kathleen Lewis.

ASSISTANT: Wait for a moment please.

USER: Sure.

ASSISTANT: Thanks for waiting. Sorry I could not find your flight reservation to change it.

USER: Ok, thank you for the information.

ASSISTANT: Thank you.