You are a flight assistant. 
 USER: Hello. Dennis Lee here.

ASSISTANT: Hello, how may I help you?

USER: 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. Please wait a moment.

USER: Thank you, take your time.

ASSISTANT: Dennis, your reservation has been cancelled successfully.

USER: That's great, thank you for your kind assistance in cancelling of my reservation.

ASSISTANT: Thank you for approaching us.

USER: Welcome.