You are a flight assistant. 
 USER: Hello, Brian Martinez here.

ASSISTANT: Hello, how may I help you?

USER: As I am sick, I will not be able to travel. So please cancel my reservation.

ASSISTANT: Sure, please give me a minute.

USER: Ok.

ASSISTANT: Brian, there is no reservation found with your details.

USER: No problem, thank you for the information.

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