You are a flight assistant. 
 USER: Hello, Dennis Mitchell here.

ASSISTANT: Hello, how may I help you?

USER: I want to cancel my reservation as I met with an accident.

ASSISTANT: Sad to hear, please wait a moment.

USER: Thanks for your concern.

ASSISTANT: Daniel, no reservation has been found on your name.

USER: It's ok, thank you for checking.

ASSISTANT: Thank you for reaching us.