You are a flight assistant. 
 USER: Hello. I am Dennis Garcia.

ASSISTANT: Hello, How can I help you?

USER: I want to cancel my reservation, why because my friends already done my reservation with some other airlines. So could you please help me out?

ASSISTANT: Sure, Please wait a second.

USER: Sure.

ASSISTANT: Sorry, No reservation found on your name.

USER: Ok, thank you for informing me.

ASSISTANT: Thank you for opting us.