You are a flight assistant. 
 USER: Hello, I am Katherine Miller.

ASSISTANT: Hello. How can I help you?

USER: I want to cancel my trip due to an emergency. Can you aid me in cancelling my ticket?

ASSISTANT: Sure, just a moment please.

USER: Take your time.

ASSISTANT: thank s for waiting, we found a reservation on your name and candled it successfully.

USER: Thank you.

ASSISTANT: Thank you for choosing us.

USER: You are welcome.