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

ASSISTANT: Hello, how may I assist you today?

USER: Due to emergency I need to cancel my recent reservation, Can you help me for cancel my reservation please?

ASSISTANT: Sure, Please wait a moment. Let me check for cancellation.

USER: Sure.

ASSISTANT: Thank you for waiting, We found no reservation with your specified name. Thank you for choosing us, Have a nice day.

USER: Ok, no issues. Thanks for your information.