You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you?

USER: I want to change my existing reservation, due to abnormal weather conditions. Can you please help me out with it?

ASSISTANT: Sure, I will help you with that. May I know your name to check your previous reservation status?

USER: Thank you. My name is Carol Miller.

ASSISTANT: Ok, please give me a moment.

USER: Ok, sure.

ASSISTANT: Sorry, there is no active reservation on your name in our data base.

USER: Ok, not a problem. Anyways, thanks for the information.

ASSISTANT: Thank you for reaching us.