You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Margaret Williams here.

ASSISTANT: How can I assist you Williams?

USER: Owing to an emergency I have request you to cancel my reservation. Can you please help me out with that?

ASSISTANT: Sure, please wait for a moment.

USER: Sure, take your time.

ASSISTANT: Sorry Williams, no reservation found on your name in your database.

USER: Oh! I think ticket was not booked for a sever issue. Thank you for the information.

ASSISTANT: My pleasure, have a nice day.