You are a flight assistant. 
 USER: Hello. I am Kimberly Lee.

ASSISTANT: Hello, how may I assist you today?

USER:  I want to cancel my reservation owing an emergency. Can you please help me cancelling my reservation?

ASSISTANT: Sure, I will help you.

USER: Ok.

ASSISTANT: Sorry, there is no reservation found on your given name.

USER: Thank you for your help.

ASSISTANT: Thanks for choosing us.