You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: Can you please be my helping to change my existing reservation, due to bad weather conditions?

ASSISTANT: Sure, we are here to help you. May I know your name please?

USER: Sure, my name is Paul Green.

ASSISTANT: Please stand by.

USER: Sure.

ASSISTANT: Thanks for your time, there is no active reservation found in your name.

USER: Ok, thanks for your help.

ASSISTANT: Thank you for choosing us.