You are a flight assistant. 
 USER: HI.

ASSISTANT: Hello.

USER: David Parker here.

ASSISTANT: How can I help you today?

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 with that.

USER: Ok.

ASSISTANT: Please wait a moment, I will check your reservation status.

USER: Ok sure.

ASSISTANT: There is no previous reservation found on your name David Parker.

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

ASSISTANT: You are welcome.