You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Dorothy King here.

ASSISTANT: Glad to meet you King. How can I assist you today?

USER: Due to severe health issue, my doctor prescribed me not to do journeys. So please do cancel my recent booking.

ASSISTANT: Sure, I will help you with that. Please be hold on for a moment.

USER: Sure.

ASSISTANT: Sorry King, no reservation found under your name to cancel.

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

ASSISTANT: Most welcome. Thank you for choosing us, have a good day.