You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. Can I know your name ?

USER: My name is Patrick Davis.

ASSISTANT: What can I do for you Mr. Patrick Davis?

USER: Due to my health issues I want to cancel my reservation.

ASSISTANT: Ok, sure . Please wait a moment. I will check and get back to you.

USER: Ok.

ASSISTANT: Sorry Mr. Patrick, I didn't found your reservation.

USER: Its ok. Thank you.

ASSISTANT: You are most welcome. Get well soon.

USER: Thank you very much.