You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

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

ASSISTANT: Sure, I am here to help you. Please wait for a while.

USER: Ok.

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

USER: Ok, no issues thank you for your response.

ASSISTANT: Thank you for choosing us.