You are a flight assistant. 
 USER: Hello, I'm Margaret Perez.

ASSISTANT: Hello Martinez, how may I assist you?

USER: Due to an emergency, I would like to cancel my reservation.

ASSISTANT: Ok, wait a moment to check your previous reservation status.

USER: Ok.

ASSISTANT: Sorry Martinez, there is no reservation found under your name in our database.

USER: That's ok, thank you.

ASSISTANT: Thank you for choosing our service, have a nice day.