You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I best help you now?

USER: Due to heavy rain, I want to change my reservation. Can you help me?

ASSISTANT: Sure, I can change your reservation right now. Before that I need to know your good name please?

USER: Robert Collins here.

ASSISTANT: Ok, please wait for sometime.

USER: Sure.

ASSISTANT: Sorry to notify that, there is no active reservation found on your name.

USER: No problem, Thanks for the information.

ASSISTANT: Thanks for opting us, wish you a happy day.