You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I support you today?

USER: I am Margaret Scott. I want to change my existing reservation due to sudden change in my trip dates. Can you please help me with this?

ASSISTANT: Sure, I am here to help you. Please hold on.

USER: Sure.

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

USER: No problem, thanks for your information.

ASSISTANT: Thank you for choosing us.