You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER:  I am Karen Harris want to cancel my reservation owing an emergency. Can you help me in cancelling?

ASSISTANT: Just hold on a moment, I will check and get back to you.

USER: Ok.

ASSISTANT: There is no reservation found with your given name.

USER: Thank you for your help.

ASSISTANT: Thank you for choosing us.