You are a flight assistant. 
 USER: Hello. Karen Turner here.

ASSISTANT: Hello, How can I serve you?

USER: I want to cancel my recent reservation which I have done, due to some health issues, can you help with it?

ASSISTANT: Sure, Please wait a second.

USER: Sure.

ASSISTANT: Sorry, No reservation found on your name.

USER: No issues, thank you for the information.

ASSISTANT: Thank you for opting us.