You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you out?

USER: I am John Martinez. I need to cancel my reservation for a client meeting but I have got a sudden call from my friend that one of my friend got met with an accident so I feel to cancel my reservation. Can you please help me out?

ASSISTANT: Sure, I will help you in cancelling the reservation.

USER: OK.

ASSISTANT: Sorry, there are no reservations found in our adatabase. Thank you for reaching us.

USER: That's ok, thank you.