You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am Betty Lewis, I want to change my reservation as my plan to meet my uncle is postponed. Can you help me to change my reservation?

ASSISTANT: Sure, please wait for a while.

USER: Sure.

ASSISTANT: Sorry, no reservation found on your name.

USER: Ok, thanks for the information.

ASSISTANT: Thank you for approaching us.