You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: My name is Kimberly Evans, I want to change my reservation as my plan for vacation is postponed. Can you change my reservation?

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: Sorry, no reservation found by your name.

USER: Ok, thank you for the information.

ASSISTANT: Thanks.