You are a flight assistant. 
 USER: Hello, I am Betty Turner.

ASSISTANT: Hello. How may I amend you now?

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

ASSISTANT: Ok. Please standby.

USER: Ok.

ASSISTANT: Sorry, we did not find any reservation on your name.

USER: Ok, no problem.

ASSISTANT: Thank you for choosing us.

USER: Thanks for your service.