You are a flight assistant. 
 USER: Hello. I am Joshua Edwards.

ASSISTANT: Hello, how can I serve you today?

USER: I want to cancel my reservation due to my health issue, help me in cancelling my reservation.

ASSISTANT: Sure, please wait a minute.

USER: Sure.

ASSISTANT: Sorry to say that there are no flights with your specifications. No reservation found.

USER: No problem, thank you.

ASSISTANT: Thank you for reaching us.