You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you out?

USER: Alexander Green here, can you help me with cancelling my reservation?

ASSISTANT: Sure, I will help out in cancelling the reservation.

USER: Thank you.

ASSISTANT: May I know your name please? Sorry, there are no reservations found.

USER: Ok, that's fine. Thank you for checking with my reservation.

ASSISTANT: Thank you for choosing us.

USER: Most welcome.