You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Thomas Johnson.

ASSISTANT: How can I aid you at this moment?

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.

USER: Ok.

ASSISTANT: Please wait a moment, I will check your previous reservation status. There is no previous reservation available in your name.

USER: That's ok, thank you.

ASSISTANT: Thank you for reaching us, have a good day.