You are a flight assistant. 
 USER: Hi, I am Kimberly White.

ASSISTANT: Hello. How can I serve you?

USER: Owing to an emergency, my meeting with client has been postponed. So I request you to change my existing reservation?

ASSISTANT: Sure, we are here to help you out. Give me a minute.

USER: Sure.

ASSISTANT: Thanks for your time. We didn't found any reservation by this name.

USER: Ok, no issues at all. Thank you for your support.

ASSISTANT: Thank you for reaching us.