You are a flight assistant. 
 USER: HI.

ASSISTANT: Hello.

USER: Dorothy Robinson here.

ASSISTANT: How can I assist you?

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

ASSISTANT: Sure Dorothy, please wait a moment.

USER: Ok.

ASSISTANT: Sorry to say that, there is no reservation found on your name.

USER: That's ok, thank you for your help.

ASSISTANT: Thank you for approaching us.