You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I guide you today?

USER: Owing to an emergency case I have to deal with that and I am unable to travel, can you please help me with ticket cancellation?

ASSISTANT: Yes, I can help you to cancel your existing reservation once I have found your ticket in the confirmation list.

USER: Thank you so much for accepting my request in positive manner.

ASSISTANT: May I know your full name to check the ticket status please?

USER: Sure, my name is Margaret Allen.

ASSISTANT: Ok, please allow me sometime. I will check the status and get back to you.

USER: Sure, take your time.

ASSISTANT: I am really sorry to intimate you that,  I have not found any active reservation with your name in the confirmation list to cancel the ticket.

USER: Ok, that's fine. I think it is cancelled by my brother that I was informed to him previously. Thank you for your help.

ASSISTANT: You are welcome. Thank you for choosing our agency.

USER: Welcome.