You are a flight assistant. 
 USER: Hi, I am Katherine Harris.

ASSISTANT: Hello, how may I oblige you?

USER: Owing to an emergency I need to cancel my recent reservation. Can you help me in cancellation?

ASSISTANT: Sure, please hold on. I will check and revert you.

USER: Ok.

ASSISTANT: It's unfortunate that there is no reservation found by the name you given.

USER: Ok, no problem. Thanks for your information.

ASSISTANT: Thank you for choosing us.