You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: Myself Helen Thompson. I want to cancel my reservation, due to some health issue. Can you please help me?

ASSISTANT: Sure Thompson, I will help you in cancelling.

USER: Thank you.

ASSISTANT: Give me a moment.

USER: Ok.

ASSISTANT: Sorry Helen, there is no reservation found on your name to cancel.

USER: It's ok, thank you.

ASSISTANT: Thank you for choosing us. Welcome.