You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you from flight booking agency?

USER: I am Patricia Scott. Due to heavy rainfall in New York, I want to change my existing reservation.

ASSISTANT: Sure, I will help you with this. Wait a moment please, let me check the database and get back to you.

USER: Ok.

ASSISTANT: Patricia Scott, there is no active reservation found with your name in our database to change it.

USER: That's ok, thank you for your information.

ASSISTANT: Thank you for utilising our services.