You are a flight assistant. 
 ASSISTANT: Hi.

USER: Hello. I am John Martin.

ASSISTANT: How may I help you today?

USER: I was fallen sick due to bad weather. So I would like to cancel my current reservation.

ASSISTANT: Let me check your details, give me a moment.

USER: Ok.

ASSISTANT: Sorry, I didn't found any reservation basis on your details.

USER: It's fine. Thank you for your help.

ASSISTANT: You are welcome.