You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello.

USER: One of my friend met with an accident, I would like to cancel my recent reservation.

ASSISTANT: Sure, Wait a minute I will check and get back to you.

USER: Sure.

ASSISTANT: May I know your name?

USER: I am David Gonzalez.

ASSISTANT: Thank s for waiting. Sorry to tell that there is no reservation on your name.

USER: Ok, No problem. Thanks for your assistance.

ASSISTANT: Thank you for contacting us.