You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Owing an emergency, I want to cancel my reservation. Can you help me for that?

ASSISTANT: Sure, may I know your name please?

USER: My name is Susan Jackson.

ASSISTANT: We found a reservation with your given name, shall I cancel it?

USER: Ok, please cancel  it.

ASSISTANT: Your flight ticket has been cancelled.

USER: Thank you for your help.

ASSISTANT: Thank you for choosing us.