You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

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

ASSISTANT: Sure, may I know your name please?

USER: Ok, I am John Miller.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

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

USER: Yes, you can.

ASSISTANT: Your flight ticket has been cancelled.

USER: Thank you for your help.

ASSISTANT: Thank you for choosing us.