You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Unfortunately, my grandfather got mild heart attack. So I would like to cancel my reservation and take care of him.

ASSISTANT: Ok, I am happy to help you. Can I know your name for cancelling purpose?

USER: My previous reservation has done with the name of Brandon Taylor.

ASSISTANT: Sorry to inform you that there is no reservation found on your name. Thank you for reaching us.

USER: Ok, may be my brother has already cancelled my ticket. Thank you for your help.

ASSISTANT: Ok. You are welcome.