You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Robert Turner.

ASSISTANT: How can I help you, Robert?

USER: Due to heavy rainfall in my city, I would like to cancel my reservation.

ASSISTANT: Ok, please give me few seconds to check your existing reservation details.

USER: Sure.

ASSISTANT: Robert, there is no reservation found under your name to do cancellation.

USER: It's fine.

ASSISTANT: Thank you for choosing us.

USER: Thank you for your immediate response.