You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you today?

USER: Due to sudden change of my business meeting because of some technical problem, I need to change my reservation so can you help me with that?

ASSISTANT: Sure, I am glad to help you with that. Can I know your name to check your previous reservation?

USER: I am Kimberly Parker.

ASSISTANT: Please be on hold.

USER: Sure.

ASSISTANT: We regret to inform you that, there is no reservation found on your name in our reservation list.

USER: Ok, no issues. Thanks for the information.

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