You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER:  I am Alexander Green want to cancel my reservation due to an emergency at home.

ASSISTANT: Ok, please wait for a moment.

USER: Ok.

ASSISTANT: I found reservation with your name.

USER: Cancel my reservation.

ASSISTANT: Ok, your flight ticket has been cancelled successfully.

USER:  Thank you.

ASSISTANT: Thanks for choosing us.