You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Joseph Adams here.

ASSISTANT: How may I assist you?

USER: I would like to cancel my reservation due to sudden health issue happened to my son, can you please help me out with that?

ASSISTANT: Sure, I will help you in cancellation.

USER: Thank you.

ASSISTANT: I have searched online but I could not find your flight reservation to cancel it.

USER: Oh! I think the ticket was not booked due to server issue. Anyway, thank you for the information.

ASSISTANT: Thank you.