You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I address you?

USER: I am Paul Green. I am planning to cancel an existing reservation, due to health issue. Can you please cancel my ticket?

ASSISTANT: Yes, please wait a minute I will get back to you.

USER: Sure, I will wait for your reply.

ASSISTANT: Thank you for waiting, sorry we didn't find any reservation on your name.

USER: That's fine, thank you for your service.

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