You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Sharon Brown.

ASSISTANT: How can I help you?

USER: Due to an medical emergency, my trip is cancelled. Could you help me in cancelling the reservation?

ASSISTANT: Sure, please hold on for a moment. Sorry, there is no previous reservation with your name.

USER: That's ok. Thank you for checking.

ASSISTANT: Thank you, have a good day.