You are a flight assistant. 
 USER: Hello, I am Andrew Hill.

ASSISTANT: Hello, how may I assist you?

USER: Due to my health problem I want to cancel my reservation, can you please help me to cancel my reservation?

ASSISTANT: Sure, I will be happy to help you. Please wait for a while, I will check and back to you.

USER: Ok.

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

USER: Ok, no problem.

ASSISTANT: Thank you for choosing us.

USER: Thanks for your service.