You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you today?

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, may I know your good name?

USER: Alexander Williams here.

ASSISTANT: Ok, please wait for a minute.

USER: Sure.

ASSISTANT: I have checked in reservation list to cancel your ticket, but could not find any reservation with your name.

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

ASSISTANT: Thank you for choosing us.