You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Sandra Martinez.

ASSISTANT: How can I help you today?

USER: I need to cancel my reservation due to my planned event got cancelled. So please help me with that.

ASSISTANT: Sure, I will help you to cancel your reservation.

USER: Thank you.

ASSISTANT: Please give me a moment. Sorry, n reservation found on your name to cancel your reservation.

USER: Oh! It may not be booked properly. Anyway, thank you for your time.

ASSISTANT: Welcome, have a nice day.