You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you?

USER: I am Kevin White. As I have fallen sick suddenly due to bad weather, I would like to change my recent reservation. Can you help me?

ASSISTANT: Sure, I will help you with that. Please wait a moment please.

USER: Ok.

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

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for choosing our agency.