You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am Robert Roberts. I am planning to cancel my recent reservation, due to health issue. Can you please cancel my ticket?

ASSISTANT: Sure, just a moment please.

USER: Sure, I will wait.

ASSISTANT: I am sorry no reservation found on your name.

USER: Thank you for your service.

ASSISTANT: Thank you for choosing us.