You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I want to change my reservation as my plan to Washington is postponed. Can you help me?

ASSISTANT: Sure, may I know your name please?

USER: My name is Larry Davis.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Sorry Larry Davis, there is no active reservation found with your name in our records.

USER: Ok, thank you for the information.

ASSISTANT: Most welcome.