You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you?

USER: I am William Anderson. Can you help me in cancelling my reservation, owing an emergency?

ASSISTANT: Sure, please allow me a moment to check it.

USER: Ok.

ASSISTANT: I have found your previous reservation and it has cancelled successfully.

USER: Thank you.

ASSISTANT: You are most welcome and thank you for reaching us.