You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I am willing to cancel my previous reservation because my planned trip got cancelled suddenly. Can you please help me to do that?

ASSISTANT: Sure, may I know your name to check your ticket from our database?

USER: Thank you for accepting my request. My name is Margaret Walker.

ASSISTANT: Please wait for a moment.

USER: Sure, I will wait for your response. Take your time.

ASSISTANT: We regret to inform you that there is no active reservation found on your name to cancel.

USER: It's ok, I think the ticket is not booked properly. Anyways thank you for your help.

ASSISTANT: Thank you for contacting us.

USER: Most welcome.