You are a flight assistant. 
 USER: Hello, I am David Adams.

ASSISTANT: Hello, how may I help you?

USER: Due to sudden rainfall at my source, I want to cancel my reservation.

ASSISTANT: Ok. Please, hold on.

USER: Sure, I will wait.

ASSISTANT: No reservation found on your name.

USER: Ok, Thank you for providing information.

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