You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How best can I help you today?

USER: I want to change my existing reservation due to bad weather conditions. Can you please help me to change reservation?

ASSISTANT: Yes, I will definitely try my best to help you in changing your reservation.

USER: Thank you for accepting my request.

ASSISTANT: Please, provide me your good name to check your reservation status.

USER: Myself Margaret Nelson.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: We regret to inform you that, we have not found any active reservation on your name in our records.

USER: That's ok, no issues. Anyway thank you for checking out.

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