You are a flight assistant. 
 USER: Hello, I am Kevin White.

ASSISTANT: Hello, how may I support you for the day?

USER: Due to bad weather, meeting has been postponed. Can you please help me out in changing my recent reservation?

ASSISTANT: Sure, I will help you in changing the existing reservation. Please give me a minute.

USER: OK.

ASSISTANT: Sorry, there is no reservation found on your name.

USER: OK, no problem. Thanks for the information.

ASSISTANT: Thank you for approaching us, have a good day.