You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How best can I help you now?

USER: I want to cancel my recent reservation due to my health issue, so can you help me with this?

ASSISTANT: Sure, I am here to help you in cancelling.

USER: Thank you.

ASSISTANT: For the process of cancelling, we need to know on whose name it was reserved previously. So, can you please provide me your name?

USER: My name is William Phillips.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Sorry, there is no reservation found on your name in our records.

USER: Not a problem, thanks for checking.

ASSISTANT: Thank you for choosing us, have a good day.