You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: I am Brian Mitchell.

ASSISTANT: Ok.

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

ASSISTANT: Sure Brian Mitchell, I will help you.

USER: Thank you.

ASSISTANT: Please wait for a while.

USER: Ok.

ASSISTANT: Sorry, no reservation found on your name in our records.

USER: Ok, no problem. Thank you.

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