You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Laura Lewis.

ASSISTANT: How may I help you Laura?

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

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

USER: That's fine. Thank you for your time.

ASSISTANT: Thank you for reaching us.