You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you today?

USER: Due to bad weather conditions, I want to change my existing reservation. Can you help me out?

ASSISTANT: Sure, let me check your reserved ticket in our database.

USER: Ok.

ASSISTANT: May I know your name?

USER: Sure, my name is Barbara Moore.

ASSISTANT: Sorry Moore, no reservation found by your name.

USER: That's fine, thank you.

ASSISTANT: Thank you for contacting us.