You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: I am Kimberley Nelson, I want to change my reservation date as my plan to visit friend house is postponed.

ASSISTANT: Sure, please wait a moment, let me check your reservation with us and get back to you. Thanks for your valuable time, sorry, unfortunately no reservation found with provided name.

USER: Thanks for the information.

ASSISTANT: Thanks for reaching us, have a great day ahead.