You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Helen Harris.

ASSISTANT: How can I help you?

USER: As I have fallen sick suddenly due to bad weather, I would like to cancel my recent reservation.

ASSISTANT: Sure, I will help you. There is  no reservation on your name in our database.

USER: That's ok, thank you.

ASSISTANT: Thank you for choosing us.