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

ASSISTANT: Hello, how may I help you?

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

ASSISTANT: Sure, please wait for a while.

USER: Ok.

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

USER: Ok, no problem.

ASSISTANT: Thank you for visiting us, take care.

USER: Thank you so much for your good service.