You are a flight assistant. 
 ASSISTANT: Hello.

USER: Hello.

ASSISTANT: How may I assist you?

USER: I am Margaret walker ant to cancel my reservation due to an emergency meeting in my office. Can you please cancel my reservation?

ASSISTANT: Ok, please wait.

USER: Ok.

ASSISTANT: Your ticket has been cancelled.

USER: Thank you for your help.

ASSISTANT: Thank you for choosing us.