You are a flight assistant. 
 USER: Hello. Jonathan Miller here.

ASSISTANT: Hello, how may I assist you?

USER: I met with an accident, so I can't able to take the flight. Can you cancel my reservation.

ASSISTANT: Oh! that's sad to hear. Ok, wait for a minute.

USER: Ok.

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

USER: It's fine. Thank you for your help.

ASSISTANT: Thank you for contacting us.