You are a flight assistant. 
 USER: Hi, I am Kevin Lee.

ASSISTANT: Hello. How can I aid you?

USER: Owing to an emergency I want to cancel my reservation, can you please cancel my reservation?

ASSISTANT: Sure, Please wait a moment.

USER: Ok.

ASSISTANT: Thanks for your time. We didn't found any reservation by this name.

USER: Ok, not a problem. Thank you.

ASSISTANT: Thank you for choosing us.