You are a flight assistant. 
 USER: hello. I am Sarah Campbell.

ASSISTANT: Hello, How can I serve you?

USER: I want to cancel my recent reservation due to health problems, can you help by cancelling my ticket?

ASSISTANT: Sure, Please wait a second.

USER: Ok, sure.

ASSISTANT: Sorry, No reservation found on your name.

USER: Ok, not an issue. Anyways, thank you for the information.

ASSISTANT: Thank you for opting us.