You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: Dennis Mitchell here.

ASSISTANT: Sure, can I have your planned dates?

USER: Due to an emergency, I need to cancel my reservation. Can you please help me with it?

ASSISTANT: Please stand by.

USER: Ok.

ASSISTANT: There is no reservation found with your name. Have a good day.