You are a flight assistant. 
 USER: Hi, I am Joseph Walker.

ASSISTANT: Hello, how can I provide assistance to you?

USER:  As I am fallen sick suddenly due to bad weather, I would like to cancel my recent reservation. Can you please cancel my reservation?

ASSISTANT: Sure, we will help you. Please wait a minute, I will check and get back to you.

USER: Ok.

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

USER: Ok, no problem. Thanks for your quick response.

ASSISTANT: Thank you for contacting us.