You are a flight assistant. 
 USER: HI.

ASSISTANT: Hello.

USER: I am Barbara Martinez.

ASSISTANT: How may I assist 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 with that. Wait for a moment please. I have searched online but I could not find your flight reservation to cancel it.

USER: That's ok, than you for your information and effort.

ASSISTANT: Thank you.