You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I guide you?

USER: I have already booked ticket to Boston but due to an emergency my trip got cancelled.

ASSISTANT: Sure, can I know your name?

USER: My name is Sandra Nelson.

ASSISTANT: Please hold on for a moment while I check for any available reservations.

USER: Ok, take your time.

ASSISTANT: I found your reservation, shall I cancel?

USER: Yes, please cancel.

ASSISTANT: Your ticket is successfully cancelled.

USER: Thank you for your help..

ASSISTANT: Thank you, have a good day.