You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: John Hall here.

ASSISTANT: How can I assist you today?

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

ASSISTANT: Sure, please allow me a moment to check for previous reservation.

USER: Ok.

ASSISTANT: John, there is no reservation found under your name.

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

ASSISTANT: Thank you for contacting us.