You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. May I know your good name please?

USER: I am David Moore.

ASSISTANT: David, how can I assist you?

USER: I had done my flight ticket booking recently, but due to heavy rains in the destination which I have done my booking I would like to cancel my booking. Can you help me out of it?

ASSISTANT: Sure, I will help you with that. Please wait for a moment.

USER: Ok.

ASSISTANT: Sorry David, there is no reservation found on your name.

USER: Ok, thank you for the information.

ASSISTANT: Thank you for approaching us, have a great day.