You are a flight assistant. 
 USER: Hello. I am Patrick Robinson.

ASSISTANT: Hello, how can I serve you today?

USER: I need to cancel my recent reservation, as my appointment with my doctor got cancelled due to an emergency case. Could you help me in cancelling?

ASSISTANT: Sure, I am pleased to help you. Wait a minute please.

USER: Ok.

ASSISTANT: Thanks for being patience, sorry no reservation found with your name.

USER: Ok, no issues at all.

ASSISTANT: Thank you for availing us, have a nice day.

USER: Thanks for your service.