You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I guide you at this moment?

USER: I want to cancel my recent reservation, due to some health problem. Can you help me?

ASSISTANT: Sure, I will help you with the ticket cancellation.  Can I have your name?

USER: Thank you. I am Patrica Robinson.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Sorry to tell you, there is no reservation under your name to cancel.

USER: Ok, no problem. Anyway's thank you for your information.

ASSISTANT: You are welcome. Thank you for choosing us.