You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. What can I do for you today?

USER: I am Gregory Lee, I want to change my reservation as my plan to meet my friend at Charlotte is postponed. Can you change my reservation?

ASSISTANT: Sure, please wait for few minutes.

USER: Sure.

ASSISTANT: There is no recent reservation found on your name.

USER: Ok, thank you for information.

ASSISTANT: Thank you for approaching us.